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What causes ulcerative colitis?

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Doctors don't know exactly what causes ulcerative colitis, but some researchers think it might be related to problems with your immune system -- your body's defense against germs. An infection with a virus or bacteria in your colon may trigger the inflammation that's linked with the disease.

From: Ulcerative Colitis Treatment WebMD Medical Reference

SOURCES:

National Digestive Diseases Information Clearinghouse.

Crohn's & Colitis Foundation of America: "What are Crohn's & Colitis?" "Surgery for Crohn's Disease & Ulcerative Colitis."

FDA: "FDA approves Inflectra, a biosimilar to Remicade." “FDA approves Amjevita, a biosimilar to Humira.”

Reviewed by Melinda Ratini on September 4, 2018

SOURCES:

National Digestive Diseases Information Clearinghouse.

Crohn's & Colitis Foundation of America: "What are Crohn's & Colitis?" "Surgery for Crohn's Disease & Ulcerative Colitis."

FDA: "FDA approves Inflectra, a biosimilar to Remicade." “FDA approves Amjevita, a biosimilar to Humira.”

Reviewed by Melinda Ratini on September 4, 2018

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Who gets ulcerative colitis?

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