Diseases of the Large Intestine Return to top Irritable bowel syndrome occurs more frequently in women under age 35, and often begins in late adolescence. Its symptoms are similar to a number of other illnesses, including diverticulosis and lactose intolerance. These symptoms include uncomfortable abdominal sensations and periodic diarrhea or constipation, sometimes occurring alternately. Some patients come to depend on laxatives and even enemas to alleviate the constipation. For others, the only symptom is painless diarrhea.
Treatment includes a diet high in fiber and low in fat.
Certain gas-producing foods, such as those in the cabbage family, should be avoided, as should any other suspected irritants. Ulcerative colitis is an inflammation of the colon that produces ulceration of the inside wall. Its primary symptom is bloody, chronic diarrhea, often containing pus and mucus, and associated with abdominal pain and weight and appetite loss. When confined to the rectum, it's referred to as ulcerative proctitis. Though there is no known cause of ulcerative colitis, it does tend to run in families and is more common in Jews and caucasians than other ethnic or racial groups.