Symptoms of collagenous colitis and lymphocytic colitis include:
- Chronic watery, non-bloody diarrhea
- Abdominal pain
Collagenous colitis and lymphocytic colitis are diagnosed by microscopic examination of several tissue samples taken from the large intestine lining. Collagenous colitis has an abnormally large, or thickened, protein band, called collegen, inside the colon lining whereas lymphocytic colitis has an increase in white blood cells, known as lymphocytes, between the cells lining the colon. To obtain these tissue samples to diagnose collagenous colitis or lymphocytic colitis, a colonoscopy or a flexible sigmoidoscopy is performed.
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