Crohn's disease is a chronic form of inflammatory bowel disease, or IBD, in which the immune system drives ongoing inflammation in the digestive tract. The inflammation can appear anywhere along that tract, though it most often settles where the small intestine meets the colon. It tends to affect scattered segments of bowel, leaving healthy stretches in between, and it can reach through the deeper layers of the intestinal wall.
Crohn's disease usually moves between active periods, called flares, and quieter periods called remission. It is a lifelong condition, but treatment has advanced steadily, and many people keep it well controlled for years at a time.
Common symptoms
Frequent symptoms include abdominal pain or cramping, persistent diarrhea, fatigue, reduced appetite, and weight loss. Some people develop mouth sores or pain and drainage around the anus.
Because the inflammation runs deep, Crohn's disease can create complications over time, such as narrowed segments of intestine called strictures or abnormal connecting tunnels called fistulas. It can also cause symptoms outside the gut, including joint pain, skin problems, and eye irritation.
How it is diagnosed
No single test settles the question, so your gastroenterologist gathers evidence from several directions. Blood and stool tests look for inflammation and rule out infection. A colonoscopy with biopsies examines the colon and the end of the small intestine, while imaging studies such as CT or MRI scans show segments of small bowel that a scope cannot easily reach. Together, these results confirm the diagnosis and map where the disease is active.
Treatment and management
Treatment aims to quiet the inflammation, relieve symptoms, and maintain remission. Options range from anti-inflammatory and immune-modifying medicines to biologic therapies that block specific steps in the inflammatory process. Good nutrition and regular follow-up strengthen any plan, and quitting smoking matters greatly, because smoking makes Crohn's disease harder to control.
Some people eventually need surgery to repair a stricture or fistula or to remove a badly damaged segment of bowel. Surgery does not cure Crohn's disease, but paired with ongoing medical therapy, it can restore comfort and day-to-day function.
When to talk to a gastroenterologist
See a gastroenterologist if you have persistent diarrhea, recurring abdominal pain, unexplained weight loss, or blood in your stool. If you already live with Crohn's disease, keep your care team informed about flares, new symptoms, or medication side effects. A steady partnership with your gastroenterologist is central to living well with this condition.
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This page is general education, not personal medical advice. Your care team is happy to talk through what it means for you.