Krzywica
Etiologia i przyczyny

Krzywica u dzieci to choroba charakteryzująca się zaburzeniem mineralizacji kości, najczęściej spowodowana niedoborem witaminy D, co prowadzi do hipokalcemii i wtórnej nadczynności przytarczyc. Niedobór witaminy D, kluczowej dla wchłaniania wapnia i fosforanów, może wynikać z ograniczonej ekspozycji na promieniowanie UV, stosowania filtrów UV, diety ubogiej w witaminę D lub karmienia piersią bez suplementacji. Ponadto, niedobory wapnia i fosforu w diecie, zwłaszcza w okresach intensywnego wzrostu, również przyczyniają się do rozwoju krzywicy. Czynniki ryzyka obejmują ciemną pigmentację skóry, niedobór witaminy D u matki w ciąży, położenie geograficzne o niskim nasłonecznieniu, dietę wegetariańską bez suplementacji oraz choroby przewlekłe upośledzające metabolizm witaminy D i gospodarkę wapniowo-fosforanową. Wartości laboratoryjne typowe dla krzywicy to hipokalcemia i hipofosfatemia, wynikające z wtórnej nadczynności przytarczyc i zwiększonego wydalania fosforanów przez nerki.

Krzywica – Etiologia, przyczyny

Krzywica to choroba kości występująca u dzieci, charakteryzująca się zmiękczeniem i osłabieniem kości, spowodowana zaburzeniem mineralizacji rosnących kości. Etiologia krzywicy jest złożona i obejmuje różne czynniki przyczynowe, zarówno nabyte, jak i genetyczne.12

Niedobór witaminy D jako główna przyczyna

Niedobór witaminy D jest najczęstszą przyczyną krzywicy, szczególnie tzw. krzywicy odżywczej (pokarmowej). Witamina D odgrywa kluczową rolę w regulacji gospodarki wapniowo-fosforanowej organizmu, umożliwiając wchłanianie wapnia i fosforanów z przewodu pokarmowego. Niedostateczna ilość witaminy D prowadzi do obniżonego wchłaniania tych minerałów, co skutkuje nieprawidłową mineralizacją kości.23

Przyczyny niedoboru witaminy D obejmują:45

  • Niewystarczająca ekspozycja na światło słoneczne – skóra produkuje witaminę D pod wpływem promieni UV; ograniczenie czasu spędzanego na zewnątrz znacząco zmniejsza syntezę witaminy D1
  • Stosowanie kremów z filtrem UV, które blokują promienie słoneczne stymulujące produkcję witaminy D w skórze6
  • Niewystarczająca podaż witaminy D w diecie7
  • Karmienie piersią bez suplementacji witaminy D – mleko matki zawiera niewielkie ilości witaminy D8

Niedobór wapnia i fosforu

Poza niedoborem witaminy D, krzywica może być również spowodowana niedoborem wapnia lub fosforu w diecie. Wapń i fosfor są niezbędnymi składnikami mineralnymi kości.910

  • Niedobór wapnia – szczególnie istotny w regionach, gdzie dieta jest uboga w produkty bogate w wapń11
  • Niedobór fosforu – rzadziej występujący, ale również może prowadzić do krzywicy12

W przypadku dzieci występuje zwiększone zapotrzebowanie na wapń i fosfor podczas okresów intensywnego wzrostu, co zwiększa ryzyko rozwoju krzywicy w przypadku niedoborów tych pierwiastków.13

Czynniki ryzyka rozwoju krzywicy odżywczej

Istnieje szereg czynników ryzyka, które mogą zwiększać prawdopodobieństwo wystąpienia krzywicy:1415

  • Ciemna pigmentacja skóry – melanina zmniejsza zdolność skóry do produkcji witaminy D pod wpływem światła słonecznego16
  • Niedobór witaminy D u matki podczas ciąży – dziecko urodzone przez matkę z poważnym niedoborem witaminy D może urodzić się z objawami krzywicy lub rozwinąć je w ciągu kilku miesięcy po urodzeniu14
  • Położenie geograficzne – dzieci mieszkające w regionach o niewielkim nasłonecznieniu są bardziej narażone na krzywicę17
  • Dieta wegetariańska bez odpowiedniej suplementacji – może prowadzić do niedoborów witaminy D i wapnia18
  • Wyłączne karmienie piersią bez suplementacji witaminy D19

Genetyczne przyczyny krzywicy

Oprócz krzywicy odżywczej, istnieją również rzadsze formy krzywicy uwarunkowane genetycznie. Stanowią one około 13% wszystkich przypadków krzywicy.2021

Genetyczne przyczyny krzywicy można podzielić na dwie główne grupy:21

Krzywica zależna od witaminy D

Spowodowana mutacjami w genach kodujących enzymy uczestniczące w biosyntezie witaminy D lub jej receptora:2022

  • Krzywica zależna od witaminy D typu 1A (VDDR1A) – spowodowana nieprawidłowościami w genie kodującym enzym 25(OH)D3-1α-hydroksylazę19
  • Krzywica zależna od witaminy D typu 1B (VDDR1B)21
  • Krzywica zależna od witaminy D typu 2A (VDDR2A) – spowodowana defektem receptora witaminy D19
  • Krzywica zależna od witaminy D typu 2B (VDDR2B)21
Krzywica hipofosfatemiczna dziedziczna

Spowodowana zaburzeniami wchłaniania zwrotnego fosforanów w kanalikach nerkowych, co prowadzi do ich nadmiernej utraty z moczem:2223

  • Krzywica hipofosfatemiczna sprzężona z chromosomem X (XLH) – najczęstsza postać krzywicy hipofosfatemicznej, stanowiąca ponad 80% wszystkich przypadków rodzinnej hipofosfatemii, spowodowana mutacjami w genie PHEX23
  • Krzywica hipofosfatemiczna z hiperkalciurią24
  • Inne formy krzywicy hipofosfatemicznej związane z FGF23 (czynnik wzrostu fibroblastów 23) lub niezależne od FGF2321

Wtórne przyczyny krzywicy

Krzywica może również wystąpić jako powikłanie innych chorób, które wpływają na metabolizm witaminy D, wapnia lub fosforu:119

Zaburzenia wchłaniania

Choroby, które upośledzają wchłanianie witaminy D, wapnia lub fosforu z przewodu pokarmowego:25

  • Celiakia1
  • Nieswoiste zapalenia jelit1
  • Mukowiscydoza1
  • Przewlekłe zapalenie trzustki26
  • Resekcja jelit26
Choroby nerek i wątroby

Zaburzenia, które wpływają na metabolizm witaminy D lub gospodarkę wapniowo-fosforanową:27

  • Przewlekła choroba nerek – prowadzi do osteodystrofii nerkowej19
  • Kwasica kanalikowa nerkowa28
  • Choroby wątroby, takie jak marskość – upośledzają konwersję witaminy D do jej aktywnej formy13
Inne przyczyny
  • Nowotwory – rzadkie przypadki tzw. krzywicy onkogennej, spowodowanej wydzielaniem przez guzy czynników fosfotonicznych, np. FGF23, które zwiększają wydalanie fosforanów przez nerki29
  • Leki – niektóre leki, takie jak przeciwdrgawkowe (np. fenytoina), steroidy, furosemid, heparyna czy antybiotyki (tetracykliny) mogą wpływać na metabolizm witaminy D2926
  • Hipofosfatazja – rzadka choroba genetyczna powodująca niską aktywność fosfatazy alkalicznej28

Patofizjologia krzywicy

Bez względu na pierwotną przyczynę, mechanizm rozwoju krzywicy opiera się na zaburzeniach gospodarki wapniowo-fosforanowej, co prowadzi do nieprawidłowej mineralizacji kości. W przypadku niedoboru witaminy D rozwija się następujący ciąg zdarzeń:3031

Ostatecznie, niewystarczająca dostępność fosforanów niezbędnych do różnicowania się i mineralizacji chondrocytów w płytkach wzrostowych kości jest główną przyczyną rozwoju krzywicy.31

Czynniki społeczno-środowiskowe sprzyjające rozwojowi krzywicy

Krzywica, mimo że jest chorobą stosunkowo rzadką w krajach rozwiniętych, nadal stanowi istotny problem zdrowotny w niektórych regionach świata. Czynniki społeczne i środowiskowe mają znaczący wpływ na częstość występowania tej choroby.11

Czynniki geograficzne i klimatyczne

Szerokość geograficzna i związane z nią warunki nasłonecznienia odgrywają istotną rolę w rozwoju krzywicy:1714

  • Regiony położone w wyższych szerokościach geograficznych, gdzie nasłonecznienie jest ograniczone, szczególnie w okresie zimowym, charakteryzują się większym ryzykiem występowania niedoboru witaminy D i krzywicy
  • Sezonowość – zimą, gdy ekspozycja na słońce jest ograniczona, ryzyko krzywicy wzrasta
  • Zanieczyszczenie powietrza w miastach – smog może blokować promienie UV, ograniczając syntezę witaminy D w skórze

Czynniki kulturowe i społeczne

Praktyki kulturowe i społeczne również wpływają na ryzyko rozwoju krzywicy:611

  • Praktyki ubierania – zakrywanie całego ciała ze względów religijnych lub kulturowych ogranicza ekspozycję skóry na światło słoneczne
  • Migracja osób o ciemniejszej skórze do krajów o wyższych szerokościach geograficznych
  • Zmiana stylu życia – dzieci spędzają coraz więcej czasu w pomieszczeniach, ograniczając ekspozycję na światło słoneczne
  • Powszechne stosowanie kremów z filtrem UV, które, choć chronią przed nowotworami skóry, ograniczają syntezę witaminy D

Czynniki żywieniowe

Dieta i nawyki żywieniowe mają bezpośredni wpływ na podaż witaminy D, wapnia i fosforu:718

  • Diety wegetariańskie i wegańskie bez odpowiedniej suplementacji mogą być ubogie w witaminę D
  • Nietolerancja laktozy może prowadzić do ograniczenia spożycia produktów mlecznych, będących ważnym źródłem wapnia
  • Ubóstwo i brak dostępu do zróżnicowanej diety
  • Niska świadomość dotycząca znaczenia witaminy D i wapnia w diecie

Grupy szczególnie narażone na krzywicę

Określone grupy dzieci są szczególnie narażone na rozwój krzywicy:3215

  • Dzieci w wieku od 6 do 24 miesięcy życia – okres intensywnego wzrostu i zwiększonego zapotrzebowania na witaminę D, wapń i fosfor
  • Wcześniaki – mają mniejsze zapasy witaminy D zgromadzone w okresie płodowym
  • Dzieci z ciemną skórą mieszkające w regionach o ograniczonym nasłonecznieniu
  • Dzieci karmione wyłącznie piersią bez suplementacji witaminy D
  • Dzieci z chorobami przewlekłymi, szczególnie zaburzeniami wchłaniania
  • Dzieci z rodzin o niskim statusie socjoekonomicznym, z ograniczonym dostępem do opieki zdrowotnej i prawidłowego żywienia

Zrozumienie czynników etiologicznych i mechanizmów powstawania krzywicy jest kluczowe dla skutecznej profilaktyki i wczesnego leczenia tej choroby. W większości przypadków, szczególnie w krzywicy odżywczej, odpowiednia suplementacja witaminy D i wapnia, a także modyfikacja czynników ryzyka, mogą całkowicie wyleczyć tę chorobę i zapobiec jej powikłaniom.337

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Wybierz kolejny rozdział z menu poniżej, aby otworzyć nową podstronę kompedium wiedzy i uzyskać szczegółowe informację o leku, substancji lub chorobie.

  1. 10.04.2026
  2. www.leksykon.com.pl

Materiały źródłowe

  • #1 Rickets – Symptoms & causes – Mayo Clinic
    https://www.mayoclinic.org/diseases-conditions/rickets/symptoms-causes/syc-20351943
    Rickets is the softening and weakening of bones in children, often because of an extreme and prolonged vitamin D or calcium deficiency. Rare inherited problems also can cause rickets. […] Rickets can occur if your child’s body doesn’t get enough vitamin D or has problems using vitamin D properly. Occasionally, not getting enough calcium or lack of calcium and vitamin D can cause rickets. […] Children who don’t get enough vitamin D from these two sources can develop a deficiency: Sunlight. Your child’s skin produces vitamin D when it’s exposed to sunlight. But children in developed countries tend to spend less time outdoors. They also are more likely to use sunscreen, which blocks the sun’s rays that trigger the skin’s production of vitamin D. […] Some children are born with or develop medical problems that affect the way their bodies absorb vitamin D. Some examples include: Celiac disease. Inflammatory bowel disease. Cystic fibrosis. Kidney problems.
  • #2 Rickets – StatPearls – NCBI Bookshelf
    https://www.ncbi.nlm.nih.gov/books/NBK562285/
    Rickets is a condition characterized by a defect in mineralization of the epiphyseal plates. Rickets could be inherited or acquired. The acquired rickets (nutritional) is the most common cause of rickets worldwide. […] Vitamin D deficiency is, by far, the most common cause of nutritional rickets. Rarely, nutritional deficiency of calcium or phosphorus can result in rickets. Other less frequent causes of rickets include genetic causes, drug-induced rickets, and rickets secondary to liver diseases. […] The main causes of rickets worldwide in older infants and toddlers are due to vitamin D deficiency, either due to nutritional deficiency or due to insufficient sun exposure. […] Genetic causes of rickets may be classified broadly into two types: vitamin D-dependent rickets (calcipenic type), and congenital hypophosphatemic rickets (phosphopenic type).
  • #3 Rickets | Better Health Channel
    https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/rickets
    Rickets is usually caused by a lack of vitamin D, calcium or phosphorus. […] Most cases of rickets in Australia occur due to low levels of vitamin D. […] Lack of vitamin D reduces the body’s ability to control the levels of these vital minerals and increases a child’s risk of developing rickets. […] Rickets can often be prevented through preventing or treating low vitamin D levels, in addition to maintaining sufficient dietary intake of calcium and phosphate. […] Bones that are poorly mineralised generally respond very quickly to dietary supplementation with calcium and vitamin D.
  • #4 Rickets: MedlinePlus Medical EncyclopediaLock
    https://medlineplus.gov/ency/article/000344.htm
    Rickets is a disorder that occurs in children before bone growth is complete. It is caused by a lack of vitamin D, calcium, or phosphate. It leads to softening and weakening of the bones. […] Vitamin D helps the body control calcium and phosphate levels. If the blood levels of these minerals become too low, the body may produce hormones that cause calcium and phosphate to be released from the bones. This leads to weak and soft bones. […] Lack of vitamin D production by the skin may occur in people who: Live in climates with little exposure to sunlight, Must stay indoors, Work indoors during the daylight hours. […] Not getting enough calcium and phosphorous in your diet can also lead to rickets. Rickets caused by a lack of these minerals in the diet is rare in developed countries. […] Your genes may increase your risk for rickets. Hereditary rickets is a form of the disease that is passed down through families. It occurs when the kidneys are unable to hold onto the mineral phosphate. Rickets may also be caused by kidney disorders that involve renal tubular acidosis.
  • #5 Rickets: Symptoms, causes, and treatments
    https://www.medicalnewstoday.com/articles/176941
    Rickets is a childhood bone condition where bones soften and become prone to fractures. The main cause of rickets is a lack of vitamin D, but people can also inherit a certain type of rickets. […] A vitamin D deficiency may result from a low dietary intake of vitamin D or low exposure to or absorption of ultraviolet (UV) rays. This means that children who spend a lot of time indoors may be at risk of vitamin D deficiency and rickets. […] Rickets can also result from some metabolic and genetic conditions. […] There are several causes of rickets, including: […] The human body needs vitamin D to absorb calcium from the intestines. UV rays from sunlight help the skin cells convert a precursor of vitamin D from an inactive to an active state. […] If a person does not make or consume enough vitamin D, their body may not absorb sufficient calcium from the food they eat, causing low levels of calcium in the blood.
  • #6 Rickets – Wikipedia
    https://en.wikipedia.org/wiki/Rickets
    Those at higher risk for developing rickets include breast-fed infants whose mothers are not exposed to sunlight, breast-fed infants who are not exposed to sunlight, and any child whose diet does not contain enough vitamin D or calcium. […] Rickets is often a result of vitamin D3 deficiency. […] Cases have been reported in Britain in recent years of rickets in children of many social backgrounds caused by insufficient production in the body of vitamin D because the sun’s ultraviolet light was not reaching the skin due to use of strong sunblock, too much „covering up” in sunlight, or not getting out into the sun. […] The Middle East, despite high rates of sun-exposure, has the highest rates of rickets worldwide.
  • #7 Rickets: Symptoms, Diagnosis, and Treatments
    https://www.healthline.com/health/rickets
    Rickets is a skeletal disorder thats caused by a lack of vitamin D, calcium, or phosphate. These nutrients are important for the development of strong, healthy bones. […] A vitamin D deficiency makes it difficult for your body to maintain sufficient levels of calcium and phosphate. When this occurs, your body produces hormones that cause calcium and phosphate to be released from your bones. […] Rickets is most common in children who are between 6 and 36 months old. Children are at the highest risk of rickets because theyre still growing. […] You have a higher risk of developing rickets if you eat a vegetarian diet that doesnt include fish, eggs, or milk. […] One form of rickets can be inherited. This means that the disorder is passed down through your genes. […] Treatment for rickets focuses on replacing the missing vitamin or mineral in the body.
  • #7 Rickets: Symptoms, Diagnosis, and Treatments
    https://www.healthline.com/health/rickets
    For hereditary rickets, a combination of phosphate supplements and high levels of a special form of vitamin D are required to treat the disease. […] The best way to prevent rickets is to eat a diet that includes adequate amounts of calcium, phosphorous, and vitamin D. […] Rickets can also be prevented with moderate sun exposure.
  • #8 Rickets – OrthoInfo – American Academy of Orthopaedic Surgeons
    https://orthoinfo.aaos.org/en/diseases–conditions/rickets/
    The key to preventing rickets is to make sure your child is getting enough Vitamin D and calcium. […] Rickets remains a serious nutritional disorder that results from calcium or Vitamin D deficiency. Prevention of rickets is important. Playing outside in the sun for safe amounts of time and eating dairy products and other calcium-rich foods are key to preventing rickets. Vitamin D should be supplemented for most children.
  • #9 Overview of rickets in children – UpToDate
    https://www.uptodate.com/contents/overview-of-rickets-in-children
    INTRODUCTION Normal bone growth and mineralization require adequate calcium and phosphate, the two major nutritional elements that constitute the crystalline component of bone. Deficient mineralization can result in rickets and/or osteomalacia. Rickets refers to deficient mineralization at the growth plate, as well as architectural disruption of this structure. Osteomalacia refers to impaired mineralization of the bone matrix. Rickets and osteomalacia usually occur together as long as the growth plates are open; only osteomalacia occurs after the growth plates have fused. […] An overview of the pathogenesis, clinical presentation, and the differential diagnosis of rickets is presented here. The etiology and treatment of calcipenic and phosphopenic rickets are discussed separately. […] TYPES OF RICKETS Mineralization defects are classified according to the predominant mineral deficiency:
  • #10 Rickets | MedlinePlus
    https://medlineplus.gov/rickets.html
    Rickets causes soft, weak bones in children. It usually occurs when they do not get enough vitamin D, which helps growing bones absorb the minerals calcium and phosphorous. It can also happen when calcium or phosphorus levels are too low. […] In addition to dietary rickets, children can get an inherited form of the disease. […] Treatment is replacing the calcium, phosphorus, or vitamin D that are lacking in the diet.
  • #11 Nutritional rickets – a socioeconomic problem | ICCBH2019 | 9th International Conference on Children’s Bone Health | Bone Abstracts
    https://www.bone-abstracts.org/ba/0007/ba0007is6
    Rickets and osteomalacia are caused by calcium deprivation, meaning the body has insufficient calcium supply and the resulting secondary hyperparathyroidism leads to excessive bone resorption and, via renal phosphate wasting, also to hypomineralization of bone and growth plates. […] The two main environmental causes of calcium deprivation are dietary calcium deficiency and solar vitamin D deficiency. […] The environmental nature of rickets and osteomalacia is undisputed. […] The fact that rickets is most prevalent in the developing world might suggest that poverty is an important factor, in countries with lacking prevention programs, limited food supply or limited UV sunlight. […] However, rickets and osteomalacia have become a global health concern as they affect humans of all ages whose diets are low in calcium or whose cultural traditions block sunlight.
  • #11 Nutritional rickets – a socioeconomic problem | ICCBH2019 | 9th International Conference on Children’s Bone Health | Bone Abstracts
    https://www.bone-abstracts.org/ba/0007/ba0007is6
    Dark skinned people are at greatest risk, and their migration to high latitude countries is testing how well rickets prevention programs are implemented. […] Effective prevention includes provision of calcium-rich food, sunlight exposure and/or vitamin D supplements. […] We have demonstrated that fortification of wheat flour with vitamin D is cost-saving and the optimal strategy to prevent vitamin D deficiency. […] Supplementing the at-risk groups combined with a flour fortification policy offers a more effective and cost-effective option. […] Since the risk groups for rickets and osteomalacia are easily recognizable, supplementation, not testing, should become the new standard.
  • #12 Rickets and Osteomalacia Causes: Why Do These Diseases Occur?
    https://ce4rt.com/rad-tech-talk/rickets-and-osteomalacia-causes/?srsltid=AfmBOop6OL5inWqwKkOd9GjwwELZojach7oRFzwKdXb_VZZn9r3wygV_
    Rickets and osteomalacia are disorders of bone that are a result of insufficient levels of vitamin D. This deficiency is one of the most important rickets and osteomalacia causes. […] Most often, rickets and osteomalacia are the result of abnormalities in the individuals environment, such as restricted exposure to sunlight. Rarely, these disorders are inherited and are the result of a mutation in the gene that codes for the enzyme which converts vitamin D to its active form. […] Deficiency of vitamin D is a common cause of rickets and osteomalacia. […] Therefore, insufficient exposure to sunlight is one of the most common and easily modifiable rickets and osteomalacia causes. […] In addition to vitamin D deficiency, rickets and osteomalacia causes include a deficiency of phosphate in the body. […] These are relatively rare rickets and osteomalacia causes.
  • #13 Rickets: MedlinePlus Medical EncyclopediaLock
    https://medlineplus.gov/ency/article/000344.htm
    Sometimes, rickets may occur in children who have disorders of the liver. These children cannot convert vitamin D to its active form. […] Rickets is rare in the United States. It is most likely to occur in children during periods of rapid growth. This is the age when the body needs high levels of calcium and phosphate. Rickets may also be seen in children ages 6 to 24 months. It is uncommon in newborns.
  • #14 Rickets – Symptoms & causes – Mayo Clinic
    https://www.mayoclinic.org/diseases-conditions/rickets/symptoms-causes/syc-20351943
    Factors that can increase a child’s risk of rickets include: Darker skin pigmentation. Brown or Black skin has more of the pigment melanin, which lowers the skin’s ability to produce vitamin D from sunlight. Mother’s vitamin D deficiency during pregnancy. A baby born to a mother with serious vitamin D deficiency can be born with symptoms of rickets or develop them within a few months after birth. Northern latitudes. Children who live in geographical locations where there is less sunshine are at higher risk of rickets. […] If not treated, rickets can lead to: Failure to grow. Bone deformities. Dental defects. Seizures.
  • #15 What Is Rickets? – Symptoms And Treatment | familydoctor.org
    https://familydoctor.org/condition/rickets/
    Rickets is a rare disorder that affects the bones, causing them to soften and break easily. It is most common in children. […] A lack of vitamin D causes most cases of rickets. Vitamin D helps bones absorb calcium and phosphorus. If your child does not get enough vitamin D, their body may not get the nutrients it needs to make bones strong. […] Rickets is most common in children ages 6 to 24 months. This is because their bones grow rapidly during this period. Your child also may be at risk if they: Have dark skin. Don’t get enough exposure to sunlight. Don’t eat enough foods containing vitamin D, calcium, or phosphorus. Breastfeed without getting a vitamin D supplement. Have an illness that prevents their body from making or absorbing vitamin D. One example is celiac disease. […] This condition also can run in families, and children can inherit it.
  • #16 Rickets | Beacon Health System
    https://www.beaconhealthsystem.org/library/diseases-and-conditions/rickets?content_id=CON-20164396
    Some children are born with or develop medical problems that affect the way their bodies absorb vitamin D. Some examples include: Celiac disease. Inflammatory bowel disease. Cystic fibrosis. Kidney problems. […] Factors that can increase a child’s risk of rickets include: Darker skin pigmentation. Brown or Black skin has more of the pigment melanin, which lowers the skin’s ability to produce vitamin D from sunlight. Mother’s vitamin D deficiency during pregnancy. A baby born to a mother with serious vitamin D deficiency can be born with symptoms of rickets or develop them within a few months after birth. Northern latitudes. Children who live in geographical locations where there is less sunshine are at higher risk of rickets. […] If not treated, rickets can lead to: Failure to grow. Bone deformities. Dental defects. Seizures. […] Most cases of rickets can be treated with vitamin D and calcium supplements. Follow the directions as to dosage. Too much vitamin D can be harmful.
  • #17 Uncovering the hidden causes of rickets: Vitamin D deficiency in industrial England
    https://www.openaccessgovernment.org/uncovering-the-hidden-causes-of-rickets-vitamin-d-deficiency-in-industrial-england/173178/
    Contrary to popular belief, the blame for the rampant vitamin D deficiencies cannot be solely placed on factory work and polluted cities. […] The findings challenge conventional theories and highlight that latitude and seasonal lack of sunlight play a crucial role in the vitamin D levels of individuals living in the north of England. […] The study revealed markers associated with vitamin D deficiency in the interior part of 76 per cent of the teeth analysed. […] This groundbreaking discovery suggests that the latitude and the amount of sunlight during different seasons were major factors influencing vitamin D production in the skin. […] However, this research expands our comprehension of the issue, emphasising the impact of geographical location and the changing seasons on vitamin D levels.
  • #18 Rickets – OrthoInfo – American Academy of Orthopaedic Surgeons
    https://orthoinfo.aaos.org/en/diseases–conditions/rickets
    Rickets is a bone disease in children that causes weak bones, bowed legs, and other bone deformities. Children with rickets do not get enough calcium, phosphorus, or Vitamin D all of which are important for healthy growing bones. […] Rickets is most commonly an inherited disease, but it can also result from nutritional deficiency of vitamin D and calcium in a child’s diet. […] A number of factors decrease the amount of vitamin D a person can make, and therefore contribute to the risk of developing nutritional rickets: […] Poor diet. Children adopted from abroad or children experiencing extreme poverty sometimes have rickets due to a poor diet history. Lack of variety in the diet or a strictly vegetarian diet can contribute to rickets. […] Low calcium. Children with rickets usually take in less than 300 mg of calcium per day (about one cup of milk). Growing children need from 400 mg (babies) to 1,500 mg (teens in the adolescent growth spurt) of calcium daily for good bone health.
  • #19 Rickets: Not a Disease of the Past | AAFP
    https://www.aafp.org/pubs/afp/issues/2006/0815/p619.html
    Rickets develops when growing bones fail to mineralize. […] Nutritional rickets can be caused by inadequate intake of nutrients (vitamin D in particular); however, it is not uncommon in dark-skinned children who have limited sun exposure and in infants who are breastfed exclusively. […] Vitamin Ddependent rickets, type I results from abnormalities in the gene coding for 25(OH)D3-1–hydroxylase, and type II results from defective vitamin D receptors. […] Other causes of rickets include renal disease, medications, and malabsorption syndromes. […] Nutritional rickets results from inadequate sunlight exposure or inadequate intake of dietary vitamin D, calcium, or phosphorus. […] Although uncommon in the United States, vitamin D deficiency still can occur, particularly when an infant is solely breastfed, is dark skinned, or has limited sunlight exposure.
  • #19 Rickets: Not a Disease of the Past | AAFP
    https://www.aafp.org/pubs/afp/issues/2006/0815/p619.html
    Vitamin Ddependent rickets, type I is secondary to a defect in the gene that codes for the production of renal 25(OH)D31–hydroxylase. […] Vitamin Ddependent rickets, type II is a rare autosomal disorder caused by mutations in the vitamin D receptor. […] Rickets refractory to vitamin D treatment may be caused by the most common heritable form, known as vitamin Dresistant rickets or familial hypophosphatemic rickets. […] Various medical conditions and medications can cause rickets. […] Rickets caused by renal disease (renal osteodystrophy) is caused by disturbances in calcium and phosphorus regulation and calcitriol production. […] Malabsorption syndromes such as celiac disease and cystic fibrosis can cause vitamin D deficiency.
  • #20 Genetic Causes of Rickets
    https://pmc.ncbi.nlm.nih.gov/articles/PMC5790329/
    Genetic causes of rickets (hereditary rickets) are rare: accounting for about 13% of total rickets. […] They can be divided into two groups: vitamin D-dependent rickets which is caused by mutations either in enzymes involved in the vitamin D biosynthesis or vitamin D receptor, and hypophosphatemic rickets (HR) which is caused by impaired renal tubular phosphate reabsorption or transport due to genetic disorders associated with phosphatonins or phosphate co-transporters. […] The genetic causes of HR can be divided into two groups: FGF23-dependent and FGF23-independent groups. The most common genetic cause of HR is XLDHR resulting from PHEX mutations. […] Various genetic causes of rickets should be considered to avoid delay in diagnosis and treatment.
  • #20 Genetic Causes of Rickets
    https://pmc.ncbi.nlm.nih.gov/articles/PMC5790329/
    Rickets is a metabolic bone disease that develops as a result of inadequate mineralization of growing bone due to disruption of calcium, phosphorus and/or vitamin D metabolism. Nutritional rickets remains a significant child health problem in developing countries. In addition, several rare genetic causes of rickets have also been described, which can be divided into two groups. The first group consists of genetic disorders of vitamin D biosynthesis and action, such as vitamin D-dependent rickets type 1A (VDDR1A), vitamin D-dependent rickets type 1B (VDDR1B), vitamin D-dependent rickets type 2A (VDDR2A), and vitamin D-dependent rickets type 2B (VDDR2B). The second group involves genetic disorders of excessive renal phosphate loss (hereditary hypophosphatemic rickets) due to impairment in renal tubular phosphate reabsorption as a result of FGF23-related or FGF23-independent causes.
  • #21 Genetic Causes of Rickets – Journal of Clinical Research in Pediatric Endocrinology
    https://jcrpe.org/articles/genetic-causes-of-rickets/doi/jcrpe.2017.S008
    Genetic causes of rickets (hereditary rickets) are rare: accounting for about 13% of total rickets. They can be divided into two groups: vitamin D-dependent rickets which is caused by mutations either in enzymes involved in the vitamin D biosynthesis or vitamin D receptor, and hypophosphatemic rickets (HR) which is caused by impaired renal tubular phosphate reabsorption or transport due to genetic disorders associated with phosphatonins or phosphate co-transporters. […] Disorders in the biosynthesis of vitamin D or its receptor activity result in vitamin D deficiency [vitamin D dependent rickets, type 1A (VDDR1A) and type 1B (VDDR1B)] or resistance [type 2A (VDDR2A) and type 2B (VDDR2B)]. […] Hereditary HR is a group of rare, renal phosphate wasting disorders with a prevalence of 3.9 per 100,000 live births and differential diagnosis often requires genetic testing. It is characterized by renal phosphate wasting, leading to subsequent hypophosphatemia and bone mineralization defects such as rickets and osteomalacia. […] Various genetic causes of rickets should be considered to avoid delay in diagnosis and treatment. Rickets caused by calcium deficiency should also be considered, which usually occurs among older toddlers and children due to low dietary calcium intake.
  • #21 Genetic Causes of Rickets – Journal of Clinical Research in Pediatric Endocrinology
    https://jcrpe.org/articles/genetic-causes-of-rickets/doi/jcrpe.2017.S008
    Rickets is a metabolic bone disease that develops as a result of inadequate mineralization of growing bone due to disruption of calcium, phosphorus and/or vitamin D metabolism. Nutritional rickets remains a significant child health problem in developing countries. In addition, several rare genetic causes of rickets have also been described, which can be divided into two groups. The first group consists of genetic disorders of vitamin D biosynthesis and action, such as vitamin D-dependent rickets type 1A (VDDR1A), vitamin D-dependent rickets type 1B (VDDR1B), vitamin D-dependent rickets type 2A (VDDR2A), and vitamin D-dependent rickets type 2B (VDDR2B). The second group involves genetic disorders of excessive renal phosphate loss (hereditary hypophosphatemic rickets) due to impairment in renal tubular phosphate reabsorption as a result of FGF23-related or FGF23-independent causes.
  • #22 Genetic Causes of Rickets – Journal of Clinical Research in Pediatric Endocrinology
    https://www.jcrpe.org/articles/genetic-causes-of-rickets/doi/jcrpe.2017.S008
    Rickets is a metabolic bone disease that develops as a result of inadequate mineralization of growing bone due to disruption of calcium, phosphorus and/or vitamin D metabolism. […] In addition, several rare genetic causes of rickets have also been described, which can be divided into two groups. The first group consists of genetic disorders of vitamin D biosynthesis and action, such as vitamin D-dependent rickets type 1A (VDDR1A), vitamin D-dependent rickets type 1B (VDDR1B), vitamin D-dependent rickets type 2A (VDDR2A), and vitamin D-dependent rickets type 2B (VDDR2B). […] Genetic causes of rickets (hereditary rickets) are rare: accounting for about 13% of total rickets. […] They can be divided into two groups: vitamin D-dependent rickets which is caused by mutations either in enzymes involved in the vitamin D biosynthesis or vitamin D receptor, and hypophosphatemic rickets (HR) which is caused by impaired renal tubular phosphate reabsorption or transport due to genetic disorders associated with phosphatonins or phosphate co-transporters.
  • #22 Genetic Causes of Rickets – Journal of Clinical Research in Pediatric Endocrinology
    https://www.jcrpe.org/articles/genetic-causes-of-rickets/doi/jcrpe.2017.S008
    Various genetic causes of rickets should be considered to avoid delay in diagnosis and treatment. […] The genetic causes of HR can be divided into two groups: FGF23-dependent and FGF23-independent groups. […] The most common genetic cause of HR is XLDHR resulting from PHEX mutations. […] However, diagnosis of individual diseases within each group often require molecular testing to confirm diagnosis.
  • #23 Hypophosphatemic Rickets: Practice Essentials, Etiology, Epidemiology
    https://emedicine.medscape.com/article/922305-overview
    Hypophosphatemic rickets is a form of rickets that is characterized by low serum phosphate levels and resistance to treatment with ultraviolet radiation or vitamin D ingestion. […] Study of these refractory cases revealed low serum phosphate concentration as a common factor. Familial occurrence of this condition led to the diagnosis of familial hypophosphatemic rickets. […] With advances in the understanding of the genetic basis of familial hypophosphatemic rickets, the term X-linked hypophosphatemic rickets has become more commonly used. […] X-linked hypophosphatemia (XLH) is a dominant disorder and accounts for more than 80% of all familial hypophosphatemia. […] The pathogenesis of hypophosphatemic rickets is clear; phosphate wasting at the proximal tubule level is the basis of the affected individual’s inability to establish normal ossification. […] Although much has been learned about the etiology of hypophosphatemic rickets, a great deal more remains undiscovered.
  • #24 Rickets – Pediatric Bone Health Program – Endocrinology – Golisano Children’s Hospital – University of Rochester Medical Center
    https://www.urmc.rochester.edu/childrens-hospital/endocrinology/pediatric-bone-health-program/conditions-we-treat/rickets
    Malabsorption. Some children who have severe gastrointestinal or liver disease have trouble absorbing enough vitamin D, calcium, and phosphorus from their diet. […] Tumors. There are rare types of tumors that can cause the kidney to lose too much phosphorus into the urine. This condition is known as tumor-induced osteomalacia. […] Some children can develop rickets as a result of a genetic condition present at birth. Names of these conditions include: X-linked hypophosphatemic rickets (XLH), Hereditary hypophosphatemic rickets with hypercalciuria, Vitamin D-dependent rickets type I (also known as 1-alpha-hydroxylase deficiency), Vitamin D-dependent rickets type II (also known as vitamin D resistance).
  • #25 Rickets – Symptoms, Causes & Treatment – Metropolis Healthcare
    https://www.metropolisindia.com/blog/preventive-healthcare/understanding-rickets-symptoms-causes-and-treatment
    Malabsorption Issues: Certain medical conditions, like celiac disease, Crohn’s disease, or kidney disorders, can interfere with the body’s ability to absorb these vital nutrients from the digestive system. […] Hereditary Factors: Rare genetic disorders affecting the metabolism of vitamin D or phosphate can also predispose individuals to rickets.
  • #26 Ortho Globe | Rickets: Causes Symptoms Diagnosis and Treatment
    https://orthoglobe.org/rickets-causes-symptoms-diagnosis-and-treatment/
    Rickets is a condition characterized by the weakening and softening of bones, primarily caused by prolonged vitamin D deficiency. This deficiency leads to impaired calcium and phosphate absorption, which are vital for strong and healthy bones. Rickets can arise from various factors, including: […] Vitamin D Deficiency: Inadequate sunlight exposure or insufficient intake of vitamin D-rich foods. […] Malabsorption Disorders: Conditions like bowel resection, chronic pancreatitis, or cystic fibrosis can impair vitamin D absorption. […] Liver and Kidney Diseases: Liver cirrhosis and kidney disorders can disrupt the metabolism of vitamin D. […] Medications: Certain drugs, such as phenytoin, can interfere with vitamin D synthesis. […] Genetic Predisposition: Inherited conditions that affect bone metabolism or vitamin D absorption.
  • #27 Rickets | Endocrine Conditions
    https://www.yourhormones.info/endocrine-conditions/rickets/
    Rickets is a condition in children where there is abnormal softening of the bones due to the lack of key minerals. […] The commonest cause of rickets/osteomalacia is lack of vitamin D over a long period of time. […] A smaller amount of vitamin D comes from diet. […] Vitamin D deficiency can also result from the body not absorbing nutrients properly (malabsorption) due to conditions such as coeliac disease, stomach and abdominal surgery, Crohns disease and chronic. […] People with chronic kidney disease or liver disease such as cirrhosis, are also at risk of vitamin D deficiency. […] Babies depend on their mothers to provide them with adequate vitamin D. A lack of vitamin D in pregnant or breastfeeding women can lead to rickets in the child. […] Less commonly, osteomalacia/rickets can be caused by phosphate or calcium deficiency. […] Severe dietary calcium deficiency can cause rickets/osteomalacia, although it is rarely seen in the UK.
  • #28
    https://step2.medbullets.com/orthopedics/120527/rickets–osteomalacia
    Vitamin D deficiency […] Hypophosphatemia […] Chronic kidney disease […] Renal tubular acidosis […] Inhibitors of bone mineralization […] Hypophosphatasia […] impaired mineralization of osteoid (osteomalacia) and/or cartilage at the epiphyseal plates (rickets) […] Depends on the etiology.
  • #29 Rickets : Wheeless’ Textbook of Orthopaedics
    https://www.wheelessonline.com/bones/rickets/
    tumors: (see soft tissue and bone tumors) – may present as late onset rickets in a patient without family history of metabolic disease; […] many of these tumors secrete phosphatonin, which will inhibit tubular resorption of phosphate and which converts hydroxylation of 25 Vit D to 1-25 Vit D; […] chronic use of anticonvulsant medication: – lasix, heparin, steroids, INH, tetracycline;
  • #30 Rickets: Practice Essentials, Pathophysiology, Epidemiology
    https://emedicine.medscape.com/article/985510-overview
    In the vitamin D deficiency state, hypocalcemia develops, which stimulates excess secretion of parathyroid hormone. In turn, renal phosphorus loss is enhanced, further reducing deposition of calcium in the bone. […] Intestinal malabsorption of fat and diseases of the liver or kidney may produce the clinical and secondary biochemical picture of nutritional rickets. […] Studies have noted that disorders of increased fibroblast growth factor 23 (FGF-23) function are associated with rickets.
  • #31
    https://link.springer.com/article/10.1007/s00467-021-05328-w
    Rickets is a disease of the growing child arising from alterations in calcium and phosphate homeostasis resulting in impaired apoptosis of hypertrophic chondrocytes in the growth plate. […] Nutritional rickets due to vitamin D deficiency and/or dietary calcium deficiency is the most common cause of rickets. Currently, more than 20 acquired or hereditary causes of rickets are known. […] However, there is growing evidence that the ultimate cause of rickets is an insufficient availability of phosphate required for terminal differentiation and mineralization of growth plate chondrocytes. […] The discovery of new calcium and phosphate metabolism regulators, such as the phosphaturic hormone fibroblast growth factor 23 (FGF23), together with the elucidation of the underlying genetic defects in many hereditary forms of rickets and the availability of comprehensive genetic testing has improved our understanding of the underlying pathophysiology and revolutionized its diagnosis.
  • #32
    https://www.nhs.uk/conditions/rickets-and-osteomalacia/
    Rickets is a condition that affects bone development in children. It causes bone pain, poor growth and soft, weak bones that can lead to bone deformities. […] A lack of vitamin D or calcium is the most common cause of rickets. Vitamin D largely comes from exposing the skin to sunlight, but it’s also found in some foods, such as oily fish and eggs. Vitamin D is essential for the formation of strong and healthy bones in children. […] In rare cases, children can be born with a genetic form of rickets. It can also develop if another condition affects how vitamins and minerals are absorbed by the body. […] Any child who doesn’t get enough vitamin D or calcium either through their diet, or from sunlight, can develop rickets. But the condition is more common in children with dark skin, as this means they need more sunlight to get enough vitamin D, as well as children born prematurely or taking medication that interferes with vitamin D.
  • #33 Rickets – StatPearls – NCBI Bookshelf
    https://www.ncbi.nlm.nih.gov/books/NBK562285/
    The prognosis depends on the cause and severity of rickets. Nutritional rickets has a promising prognosis with prompt recognition and early institution of treatment. It can be cured completely within a few months from starting treatment. However, untreated patients may end with catastrophic complications. On the other hand, genetic causes of rickets mostly are not curable, and the treatment is symptomatic to improve the quality of life and management of complications.