Vitamin-D deficiency rickets, a disorder that becomes apparent during infancy or childhood, is the result of insufficient amounts of vitamin D in the body. The vitamin deficiency may be caused by poor nutrition, a lack of exposure to the sun, or malabsorption syndromes in which the intestines do not adequately absorb nutrients from foods. Vitamin D is needed for the metabolism of calcium and phosphorus in the body, which, in turn affects how calcium is deposited in the bones; thus it is considered essential for proper bone development and growth. Major symptoms of vitamin D deficiency rickets include bone disease, restlessness, and slow growth. This disorder is rare in the United States but is not uncommon in certain areas of the world.
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