Constipation. Mucus only bowel movements every 20min. Colonoscopy, blood test, CT all normal, no polyps. Pain in large int. What could this be?

Irritable bowel. Irritable Bowel Syndrome is the most commonly diagnosed gastrointestinal condition. The main symptoms are diarrhea and/or constipation and abdominal pain. For information on treatment see and The symptoms are the result of a complex interplay of genetics, emotional/psychological factors, and GI flora among other factors.