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1 Unexplained bone fractures or deformities. 2  Painful spasms or cramps in the face, hands and feet due to low levels of calcium in the blood (rare) 3  In rickets: bowed limbs (especially the legs), pot belly, waddling gait, disturbed growth.  Abnormal heart rhythms.
Other symptoms are excessive fatigue, daytime sleepiness, muscle weakness and vision problems. Children can develop a softening of the bones called rickets; in adults, osteomalacia or osteoporosis can occur. A vitamin D deficiency might play a role in the development of colon, breast, ovarian and bladder cancer.