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This condition can be caused by vitamin D, calcium or phosphorus deficiency. [87] Vitamin D deficiency remains the main cause of rickets among young infants in most countries because breast milk is low in vitamin D, and darker skin, social customs, and climatic conditions can contribute to inadequate sun exposure.
Decreased exposure of the skin to sunlight is a common cause of vitamin D deficiency. [1] People with a darker skin pigment with increased amounts of melanin may have decreased production of vitamin D. [3] Melanin absorbs ultraviolet B radiation from the sun and reduces vitamin D production. [3] Sunscreen can also reduce vitamin D production. [3]
The conversion of 25(OH) vitamin D to 1,25(OH)2 vitamin D is impaired, reducing intestinal calcium absorption and increasing PTH. [2] The kidney fails to respond adequately to PTH, which normally promotes phosphaturia and calcium reabsorption, or to FGF-23, which also enhances phosphate excretion. [2]
Sarcoidosis: Nephrocalcinosis is one of the most common symptoms. [7] Vitamin D: This can cause nephrocalcinosis because of vitamin D therapy because it increases the absorption of ingested calcium and bone resorption, resulting in hypercalcaemia and hypercalciuria. [1]
An excess of vitamin D causes abnormally high blood concentrations of calcium, which can cause overcalcification of the bones, soft tissues, heart and kidneys. In addition, hypertension can result. [2] Symptoms of vitamin D toxicity may include the following: Dehydration; Vomiting; Diarrhea; Decreased appetite; Irritability; Constipation ...
Vitamin D deficiency can occur. Vitamin D binding protein is lost. Hypocalcaemia: lack of 25-hydroxycholecalciferol (the way that vitamin D is stored in the body). As vitamin D regulates the amount of calcium present in the blood, a decrease in its concentration will lead to a decrease in blood calcium levels. It may be significant enough to ...
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