What Is Ulcerative Colitis?

Some bowel problems arrive once and leave. Ulcerative colitis works differently: it tends to come and go, with stretches where the gut feels almost normal interrupted by flares that are hard to ignore. The video above, "Ulcerative Colitis," runs for about four minutes and twenty seconds and lays out the basics plainly — an inflammatory bowel disease that causes long-lasting inflammation and small sores, called ulcers, in the innermost lining of the large intestine and rectum. The most useful way to understand it is by contrast: with its close relative Crohn's disease, and with its own quiet periods.

Same family, different territory

Ulcerative colitis and Crohn's disease are the two main forms of inflammatory bowel disease, and they are often mentioned in the same breath — our guide to what Crohn's disease is covers the other half of the pair. The difference is mainly geography. Ulcerative colitis stays in the colon and rectum, and it affects only the inner lining, in one continuous stretch. Crohn's can appear anywhere along the digestive tract, most often toward the end of the small intestine, and its inflammation can reach deeper through the bowel wall in patchy areas. That is why two people with "IBD" can have quite different symptoms, tests, and treatment plans — the label they share matters less than where the inflammation actually sits.

Flare versus remission: the two seasons

The anchor video makes a second contrast worth holding onto: symptoms usually develop over time rather than suddenly, and the condition moves between active and quiet phases. During a flare, the inflamed lining produces the symptoms people notice most — frequent, urgent trips to the toilet, loose stools that may contain blood or mucus, cramping abdominal pain, and a drained, tired feeling. During remission, those symptoms ease or disappear, sometimes for long stretches. A calm month doesn't mean the condition has gone, though; it means the inflammation is currently settled, which is exactly the state treatment tries to protect.

How doctors tell it apart

Because several conditions can imitate a flare — infections included — diagnosis rests on looking, not just listening. Blood and stool tests help show inflammation and rule out infection, but the decisive step is usually a camera examination of the colon, which lets the clinician see the pattern of inflammation directly and take small tissue samples. If you want to see what that examination involves, our explainer on what a colonoscopy is and how it is done walks through it. The continuous, lining-only pattern seen in ulcerative colitis is one of the main clues that separates it from Crohn's.

Settling inflammation, then keeping it settled

The anchor video is honest that ulcerative colitis has no known cure — and equally clear that treatment can greatly reduce symptoms and bring about long-term remission. In practice, care has two gears. The first is calming an active flare, usually with medicines that reduce inflammation in the bowel. The second is maintenance: continuing treatment during the quiet periods so flares become rarer and milder. When medicines cannot control the disease, surgery to remove the colon is the remaining option, and it is a decision taken with a specialist team, not a first step. And a diagnosis is not the end of an active life — the site's video "Living Well With Ulcerative Colitis" shares stories of former professional athletes who kept doing the activities they love with the condition. The realistic goal, flare by flare, is more remission than relapse.

Frequently Asked Questions

What is the difference between ulcerative colitis and Crohn's disease?
Location and depth. Ulcerative colitis affects only the colon and rectum and only the inner lining, in a continuous stretch. Crohn's disease can affect any part of the digestive tract and can inflame deeper layers of the bowel wall, in patches.

Is ulcerative colitis the same as IBS?
No. Irritable bowel syndrome affects how the bowel works, without inflammation or ulcers. Ulcerative colitis is an inflammatory bowel disease — the lining of the colon is genuinely inflamed and ulcerated, which is why blood in the stool belongs to UC and not to IBS.

Can ulcerative colitis be cured?
There is no known cure, as the anchor video states, but treatment can greatly reduce symptoms and bring about long-term remission. Removing the colon surgically ends the colitis itself, and that step is reserved for cases medicines cannot control.

Why do symptoms come and go?
The condition naturally alternates between flares, when inflammation is active, and remission, when it settles. Treatment aims to shorten flares and lengthen the quiet periods between them.

How long is the anchor video?
About four minutes and twenty seconds (4 minutes 21 seconds by the video file itself). It defines ulcerative colitis as an inflammatory bowel disease affecting the innermost lining of the colon and rectum, and explains that symptoms usually develop over time rather than suddenly.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician and researcher.

Educational only — this article is general information about ulcerative colitis, not medical advice and not a diagnosis. Blood in the stool, persistent diarrhoea, severe abdominal pain, or fever should be assessed promptly in person by your clinician.