read more (a condition of over-production of acid by a tumor) surgical removal of part of the stomach, small intestine, or large intestine surgical bypass of part of the intestine inflammatory bowel disease (such as ulcerative colitis Ulcerative Colitis Ulcerative colitis is a chronic inflammatory bowel disease in which the large intestine (colon) becomes inflamed and ulcerated (pitted or eroded), leading to flare-ups (bouts or attacks) of. read more ) Zollinger-Ellison syndrome Gastrinoma A gastrinoma is a tumor usually in the pancreas or duodenum (the first segment of the small intestine) that produces excessive levels of the hormone gastrin, which stimulates the stomach to.
Graves disease is the most common cause of hyperthyroidism. These conditions include an overactive thyroid ( hyperthyroidism Hyperthyroidism Hyperthyroidism is overactivity of the thyroid gland that leads to high levels of thyroid hormones and speeding up of vital body functions. Many medical conditions and treatments can decrease the amount of time that stool stays in the large intestine. Stool that leaves the large intestine too quickly is watery. For stool to have normal consistency, it must remain in the large intestine for a certain amount of time. Rapid passage (transit) of stool is a common cause of diarrhea.