Low calcium is a complication of celiac disease because of the damage gluten causes to the small intestine, which is responsible for absorbing this vital mineral. For this reason, low bone density is common in people with untreated celiac disease. Common signs and symptoms of low calcium include brittle nails, coarse hair, muscle cramps, fatigue, osteoporosis, dry skin, tooth decay, and depressed mood. Calcium deficiency is also associated in some cases with psoriasis, difficulty swallowing, wheezing, chest pains, fainting, and irritability.

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