Gluten intolerance can be a pain in the... well, stomach. Researchers have found a link between peptic disease (which includes GERD, heartburn, and stomach ulcers) from gluten exposure in people with celiac disease, likely caused by inflammation along the digestive tract. Digestive ulcers are painful open sores on the small intestine or stomach lining that can cause indigestion, bloating, and gastrointestinal bleeding, leading to anemia if left untreated.

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