Treating colitis depends entirely on which type you have, since the term covers several distinct conditions that inflame the colon for very different reasons. Ulcerative colitis, the most common chronic form, follows a stepwise treatment approach starting with anti-inflammatory medications for mild disease and escalating to immune-suppressing drugs or surgery when needed. Other types, like infectious colitis or microscopic colitis, have their own targeted treatments. Here’s what each path looks like.
Why the Type of Colitis Matters
Colitis simply means inflammation of the colon, but the cause determines the treatment. The major forms include ulcerative colitis (a lifelong autoimmune condition), Crohn’s disease affecting the colon, infectious colitis from bacteria or parasites, microscopic colitis (a common cause of chronic watery diarrhea, especially in older adults), and ischemic colitis caused by reduced blood flow. Each has a different underlying mechanism, and a treatment that works for one type can be useless or even harmful for another.
Getting the right diagnosis usually involves a colonoscopy with tissue biopsies, stool tests, and sometimes imaging. If you haven’t been formally diagnosed yet, that’s the most important first step, because everything that follows hinges on it.
Treating Ulcerative Colitis: The Stepwise Approach
Ulcerative colitis is the form most people are asking about when they search for colitis treatment. It causes inflammation that starts in the rectum (in about 95% of patients) and extends upward through the colon in a continuous pattern. Treatment follows a “step-up” strategy: start with the gentlest effective therapy and escalate if the disease doesn’t respond.
Mild Disease
Mild ulcerative colitis is typically treated with aminosalicylates, a class of anti-inflammatory drugs taken as pills, enemas, or rectal suppositories. These work directly on the lining of the colon to calm inflammation. Many people with mild disease can maintain remission on aminosalicylates alone for years.
Moderate Disease
When aminosalicylates aren’t enough, the next options include corticosteroids, immune-modifying drugs, biologics, or newer small-molecule medications. Corticosteroids like prednisone are effective at quickly controlling flares, but they carry significant side effects with long-term use (bone thinning, weight gain, mood changes, elevated blood sugar) and are only meant as a bridge to get inflammation under control while a longer-term therapy takes effect.
Moderate to Severe Disease
For people whose colitis doesn’t respond to standard treatments, biologics and small-molecule drugs represent the next tier. Biologics are given by infusion or injection and work by blocking specific immune proteins that drive inflammation. The main categories include drugs that block tumor necrosis factor (TNF), a key inflammatory signal, as well as newer agents that target different parts of the immune system.
A newer class of oral medications called JAK inhibitors has changed the landscape for moderate-to-severe disease. These pills block a signaling pathway inside immune cells that fuels inflammation. The first JAK inhibitor approved for ulcerative colitis works broadly across several immune signals, while newer versions target more precisely, which may reduce side effects. These drugs have the advantage of being pills rather than injections or infusions, and they tend to work relatively quickly.
In early 2025, the FDA approved a new biologic option that blocks a specific immune messenger called interleukin-23. In clinical trials, 26% of patients on this drug achieved full clinical remission at 12 weeks compared to 7% on placebo, and 36% showed visible healing of their colon lining compared to 12% on placebo. It’s the first drug in its class to offer both injection and infusion options for starting treatment.
When Surgery Becomes the Best Option
Surgery is considered when medications fail to control the disease, when side effects from drugs (particularly long-term corticosteroids) become unacceptable, or when complications like severe bleeding or precancerous changes develop. The standard procedure removes the entire colon and rectum, then creates an internal pouch from the small intestine that connects to the anus. This “J-pouch” surgery eliminates ulcerative colitis permanently, since the disease only affects the colon.
The procedure is typically done in two or three stages, with a temporary external bag (stoma) while the internal pouch heals. Most people eventually have several bowel movements per day and live without the bag long-term. It’s a major surgery with real recovery time, but for people with aggressive or medication-resistant disease, it can be life-changing.
Tracking Whether Treatment Is Working
Modern colitis treatment goes beyond just feeling better. The goal is to achieve deep healing of the colon lining, which reduces the risk of future flares, hospitalization, and surgery. One of the most useful tools for monitoring this is a stool test that measures a protein called fecal calprotectin, which rises when the colon is inflamed.
A calprotectin level of 250 micrograms per gram or below after starting treatment is a strong predictor of long-term success. In studies, patients who hit this threshold were roughly four times more likely to be in clinical remission at one year and over six times more likely to show healing on tissue biopsies, compared to those with higher levels. This test is noninvasive and can help you and your doctor decide whether a treatment is truly working or needs adjustment without requiring repeated colonoscopies.
Treating Infectious Colitis
Infectious colitis is caused by bacteria, parasites, or viruses that invade the colon. Common culprits include Campylobacter (often from contaminated food or water), Salmonella, Shigella, and E. coli. Most bacterial infections resolve on their own or with a short course of antibiotics, depending on the severity.
C. difficile colitis deserves special mention because it’s uniquely tied to antibiotic use. When antibiotics wipe out normal gut bacteria, C. difficile can overgrow and produce toxins that inflame the colon, sometimes severely. The recommended treatment is a targeted antibiotic, either vancomycin or fidaxomicin, both of which are considered first-line options. Fidaxomicin has a lower recurrence rate, which matters because C. difficile is notorious for coming back. About 1 in 5 people will have a recurrence after their first episode.
Treating Microscopic Colitis
Microscopic colitis causes persistent watery diarrhea, often many times a day, but the colon looks normal during a colonoscopy. The inflammation is only visible under a microscope, hence the name. It comes in two subtypes (collagenous and lymphocytic) that are treated the same way.
The primary treatment is budesonide, a corticosteroid that acts locally in the gut with fewer body-wide side effects than prednisone. Most people respond well, but some need a low maintenance dose to prevent relapse. Since microscopic colitis is associated with autoimmune conditions like celiac disease and thyroid disorders, screening for these can uncover contributing factors. Certain medications, including some common pain relievers and acid-reducing drugs, can trigger or worsen the condition, so reviewing your medication list with a doctor is an important step.
Treating Ischemic Colitis
Ischemic colitis happens when blood flow to part of the colon drops too low, causing tissue damage. It’s most common in older adults with heart disease, atherosclerosis, or atrial fibrillation. Mild cases often resolve on their own with bowel rest, IV fluids, and treatment of the underlying circulation problem. Severe cases with tissue death may require surgery to remove the damaged section of colon.
The key to preventing recurrence is managing the cardiovascular conditions that caused it in the first place: controlling heart failure, treating irregular heart rhythms, and managing blood pressure and cholesterol.
Diet During Flares and Remission
No diet cures colitis, but what you eat can significantly affect symptoms, especially during flares. During active inflammation, the colon struggles to process rough, fibrous, or irritating foods. A phased dietary approach can help.
During a flare, soft and pureed foods are easiest to tolerate. This means blended soups, well-cooked vegetables, smooth nut butters, and tender proteins. Seeds, raw vegetables, and high-fiber grains are typically too harsh on inflamed tissue. As symptoms improve, you can gradually reintroduce well-cooked whole foods, and eventually return to a broader diet during remission.
The IBD Anti-Inflammatory Diet takes this further with five core principles: restricting refined and processed carbohydrates (including lactose for those who are sensitive), eating prebiotic and probiotic foods like fermented vegetables and yogurt to support gut bacteria, reducing saturated fat while increasing omega-3 fats from fish and flaxseed, identifying personal food intolerances, and modifying food textures to improve absorption. This isn’t a rigid protocol. It’s a framework that you customize based on what your body tolerates.
Probiotics as Add-On Therapy
Probiotics are living microorganisms that, in the right strains and doses, can support gut health. The most studied probiotic formulation for ulcerative colitis is a high-potency multi-strain blend. In a meta-analysis of controlled trials involving over 300 patients, those who added this probiotic to their standard treatment achieved remission at nearly twice the rate of those on standard treatment alone (about 44% vs. 25%). Response rates were similarly better: 53% vs. 29%. No serious side effects were reported.
These results apply to mild-to-moderate ulcerative colitis specifically, and the probiotic was used alongside conventional medications, not as a replacement. Over-the-counter probiotic supplements vary enormously in strain composition and potency, so not every product on the shelf will have the same effect. Look for products that specify their strains and colony counts, and discuss options with your gastroenterologist.