Ulcerative colitis is treated with a combination of medications that reduce inflammation in the colon, dietary adjustments during flares, and in some cases, surgery. The specific approach depends on how much of the colon is affected and how severe the inflammation is. Most people manage the disease through long-term medication that keeps inflammation suppressed, with short courses of stronger drugs when flares occur.
Mild to Moderate Disease: Starting Treatment
For most people newly diagnosed with mild to moderate ulcerative colitis, the first medication tried is an anti-inflammatory drug that works directly on the lining of the colon. These drugs come in oral capsules, rectal suppositories, and enemas. Oral forms are typically taken as 800 mg capsules three times daily. If the inflammation is limited to the lower part of the colon (which is common at diagnosis), rectal formulations can deliver the drug right where it’s needed and often work faster for that area.
Many people with mild disease achieve and maintain remission on these medications alone, sometimes for years. The goal isn’t just to feel better but to fully heal the colon lining, because ongoing low-grade inflammation, even without obvious symptoms, increases the risk of complications over time.
Managing a Flare
Flares happen. Even on maintenance medication, periods of worsening symptoms (more frequent bloody stools, urgency, cramping) can break through. When they do, the treatment response depends on severity.
For moderately active flares, a targeted steroid formulation designed to release in the colon can be enough to regain control. For more intense flares, oral corticosteroids like prednisone at 20 to 40 mg per day are the standard rescue therapy. Steroids work fast and powerfully, but they’re strictly short-term tools. They cause significant side effects with prolonged use (bone thinning, weight gain, mood changes, elevated blood sugar) and don’t maintain remission. The dose is gradually tapered down once symptoms improve, typically over several weeks. If you find yourself needing steroids more than once or twice a year, that’s a signal your maintenance therapy needs to be escalated.
Moderate to Severe Disease: Advanced Therapies
When first-line medications can’t control the disease, a growing number of advanced therapies are available. The 2025 guidelines from the American College of Gastroenterology list several classes of drugs for moderate to severe ulcerative colitis, giving doctors and patients more options than ever before.
Biologic Medications
Biologics are lab-made proteins that block specific parts of the immune system driving inflammation. Several types are now approved. Anti-TNF drugs were the first biologics used for ulcerative colitis and remain widely prescribed. Another biologic targets a protein involved in directing immune cells to the gut, keeping them from flooding the colon lining. Newer options block immune signaling molecules called interleukins (IL-23 and IL-12/23), and the ACG guidelines now include several of these agents. Notably, the guidelines recommend one gut-selective biologic (vedolizumab) over the anti-TNF drug adalimumab for both inducing and maintaining remission, suggesting it may be a stronger first choice among biologics.
Most biologics are given by injection or infusion, ranging from every two weeks at home to every eight weeks at an infusion center, depending on the drug. It typically takes 8 to 12 weeks to see a full response. The same drug used to bring a flare under control is then continued long-term to maintain remission.
Oral Advanced Therapies
Two newer classes of oral medications have expanded options for people who prefer pills over injections. JAK inhibitors work inside cells to interrupt the signaling pathways that drive inflammation. S1P receptor modulators work differently, trapping certain immune cells in lymph nodes so fewer of them reach the colon. Both classes are taken as daily pills, which is a practical advantage for many patients. Your doctor will discuss monitoring needs, as these medications require periodic blood work to check for side effects.
Tracking Inflammation Between Appointments
Symptoms alone aren’t always a reliable gauge of what’s happening inside the colon. You can feel relatively well while still having active inflammation, or you can have symptoms from irritable bowel overlap without significant colonic disease. A stool test that measures a protein called fecal calprotectin helps fill this gap. Higher levels correlate with more active and more extensive inflammation. In people with endoscopically healed colons, calprotectin levels tend to be low, though they vary somewhat depending on how much of the colon was originally involved. People with disease affecting the entire colon, for instance, typically run higher baseline levels (around 85 mg/kg) than those with disease limited to the rectum (around 24 mg/kg), even when both are in remission. Levels climbing into the hundreds or thousands signal active inflammation and often prompt a change in treatment before a full flare develops.
This test is done at home with a simple stool sample and can be repeated every few months, reducing the need for frequent colonoscopies while still catching problems early.
Diet During a Flare
Food doesn’t cause ulcerative colitis, but what you eat during a flare can significantly affect how you feel day to day. When the colon is actively inflamed, rough or bulky foods are harder to digest and can worsen cramping, urgency, and diarrhea.
Foods to limit during a flare include raw vegetables (especially kale, cabbage, Brussels sprouts, and cauliflower), raw nuts, popcorn, dried fruit, mushrooms, tough meats like steak and jerky, and anything with a lot of insoluble fiber like apple skins and sunflower seeds. These don’t dissolve in water and can scrape against already-irritated tissue.
Better-tolerated alternatives include bananas, applesauce, blended fruit, cooked squash, fork-tender carrots, and green beans. Leafy greens can still be part of your diet if you cook them thoroughly and cut them small or blend them into smoothies. The Crohn’s & Colitis Foundation recommends thinking about the type, texture, and amount of fiber rather than avoiding all fruits and vegetables. Soluble fiber (the kind that dissolves in water) is generally easier on an inflamed colon. Raspberries, despite being a fruit, are high in soluble fiber and often well tolerated.
Once a flare resolves and your colon heals, you can gradually reintroduce a wider variety of foods. There’s no single “ulcerative colitis diet” that works for everyone in remission, but many people find that keeping a food diary helps identify personal triggers.
When Surgery Becomes the Right Option
About 15 to 20 percent of people with ulcerative colitis eventually need surgery. Unlike Crohn’s disease, ulcerative colitis is limited to the colon, which means removing the colon removes the disease entirely. Surgery is considered when a person can’t maintain an acceptable quality of life despite aggressive medical therapy, or when the disease is technically controlled but the side effects of the medications are themselves intolerable.
The most common elective procedure creates an internal pouch from the end of the small intestine and connects it to the anus, restoring the ability to have bowel movements without a permanent external bag. This is usually done in two or three staged operations over several months. Most people who have this surgery report significantly better quality of life afterward, though the pouch requires lifelong monitoring and a subset of patients develop inflammation in the pouch itself.
Surgery is also performed urgently when severe colitis doesn’t respond to intravenous medications in the hospital, or when precancerous changes are found during surveillance colonoscopy. Having a conversation with a surgeon doesn’t mean committing to an operation. Many gastroenterologists recommend a surgical consultation early in the disease course so that if the time comes, the decision feels informed rather than rushed.