Vitamin D deficiency can lead to reduced intestinal absorption of calcium and phosphorus, resulting in mineral abnormalities in bones and teeth. Lack of vitamin D in infants will cause rickets; in adults, especially pregnant women, wet nurses and the elderly, lack of vitamin D can decalcify mature bones and cause osteomalacia and osteoporosis.

When vitamin D is deficient, the bones cannot calcify normally, which can easily cause the bones to soften and bend. For example, when a child just learns to walk, the weight of the body causes the bones of the lower limbs to bend, forming an "X" or "O" shape. leg. The sternum is convex ("chicken breast"), and the connection between the ribs and costal cartilage forms a "rib bead". Delayed fontanelle closure, pelvic narrowing, and spinal curvature.

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