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Learn about Zollinger-Ellison syndrome, in which tumors in the pancreas or duodenum increase stomach acid, leading to peptic ulcers, acid reflux, and diarrhea.

Learn about Wilson disease, a genetic disorder that prevents the body from removing extra copper. Copper builds up in the liver, brain, eyes, and other organs.

Describes the causes, symptoms, diagnosis, and treatment of proctitis. Proctitis is inflammation of the lining of the rectum. Proctitis may be acute or chronic.

Overview of peptic (stomach) ulcers, including the causes, link to NSAID pain medicines, symptoms, treatments, and foods to avoid.

Defines collagenous colitis and lymphocytic colitis. Explains the causes and describes signs and symptoms, diagnosis, and treatments.

Read about symptoms and management of lactose intolerance, a condition in which you have digestive symptoms after you consume foods or drinks that have lactose.

Discusses symptoms and treatment of IBS, a group of symptoms that occur together, including repeated pain in your abdomen and changes in your bowel movements.