UC symptoms are caused by
inflammation and ulceration
of the colon.

Ulcerative colitis (UC) is a chronic disease of the colon and rectum, together known as the large intestine. When inflammation and ulceration of the large intestine mucosa, or innermost lining, occurs, tiny open sores may form on the surface of the lining.

Because inflammation damages the lining of the intestinal wall, it may bring about the onset of a flare, including:


Unlike Crohn's, UC involves damaging inflammation of only the colon and rectum.

Ulcerative colitis differs from another inflammatory bowel condition, Crohn’s disease. While Crohn's may affect any part of the gastrointestinal (GI) tract, UC only involves the colon and rectum.

In addition, UC affects only the innermost lining, whereas Crohn’s disease can affect the entire thickness of the intestinal wall.

Avoiding UC symptoms won't keep them from coming back.

People with ulcerative colitis commonly think that avoiding certain foods or situations will prevent the occurrence of their symptoms. This isn't true.

There's no evidence that any particular food groups may cause or contribute to UC, or other types of IBD. Once the disease has developed, however, paying attention to your diet may help reduce the severity of the symptoms and replace lost nutrients.

It’s also important to know that your symptoms may be linked to damaging inflammation occurring in your body. For a one-on-one setting to evaluate how you’re doing, check in with Dr. Siegel in Expert Advice.

Did you know?

Many people think that
UC affects only the colon.

UC can affect the entire large intestine, which includes the colon and the rectum.