Though the most distinctive sign of celiac disease is loose bowel movements, about 15 percent of people experience constipation when the undigested, unabsorbed food forms stool in the lower end of the small intestine, and the body is only able to absorb moisture from it. This dry, hard stool that may be difficult to pass. People with this symptom do not respond to laxatives, which is a telling sign of a larger problem.

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