Treating proctitis depends entirely on what’s causing the inflammation in your rectum. The four main types, each with a different cause and treatment path, are ulcerative proctitis (a form of inflammatory bowel disease), infectious proctitis (usually from a sexually transmitted infection), radiation proctitis (a side effect of cancer treatment), and diversion proctitis (which develops after certain bowel surgeries). Getting the right diagnosis is the essential first step, because an antibiotic that clears up gonorrhea won’t help radiation damage, and an anti-inflammatory suppository won’t cure chlamydia.
How Proctitis Is Diagnosed
Diagnosis requires a visual exam of the rectum, typically through proctoscopy or sigmoidoscopy, where a doctor inserts a thin, lighted scope to look at the rectal lining. Inflamed, red, swollen tissue confirms proctitis, but the pattern of inflammation offers clues about the cause. Small discrete ulcers and vesicles, for instance, point toward herpes.
Your doctor will also collect rectal swabs to test for gonorrhea, chlamydia, and other infections, along with blood tests for syphilis and stool tests to rule out bacterial toxins. A biopsy of the rectal tissue is sometimes needed, and a full colonoscopy may follow if inflammatory bowel disease is suspected.
Ulcerative Proctitis Treatment
Ulcerative proctitis is the mildest form of ulcerative colitis, limited to just the rectum. The first-line treatment is a rectal suppository containing mesalamine (a type of anti-inflammatory medication often called 5-ASA) at a dose of 1 gram per day. These suppositories are inserted at bedtime and deliver the drug directly to the inflamed tissue, which minimizes side effects compared to oral medications. A typical course runs 3 to 6 weeks, though you may start feeling better within a few days. It’s important to complete the full course even once symptoms improve.
Once you’re in remission, the same rectal mesalamine at the same dose is recommended for maintenance to keep symptoms from returning. This is a long-term strategy, not a one-time fix.
If mesalamine suppositories aren’t enough, your doctor has several escalation options. Rectal corticosteroid suppositories, foams, or enemas can be added, though they’re generally less effective than mesalamine for this specific condition and carry risks with prolonged use, including the need to taper off slowly to avoid withdrawal effects. For cases that still don’t respond, options include specialized suppositories containing other immunosuppressive agents or oral mesalamine.
When Standard Treatment Fails
Roughly 30% of people with ulcerative proctitis don’t respond adequately to standard topical therapy. These refractory cases are treated with the same advanced medications used for broader ulcerative colitis: immunosuppressants, biologic therapies (which target specific parts of the immune system), and newer small-molecule drugs taken by mouth. The specific choice depends on symptom severity and individual factors, following the same treatment guidelines used for ulcerative colitis overall. Oral corticosteroids are sometimes necessary as a bridge to get inflammation under control while these longer-term therapies take effect.
Infectious Proctitis Treatment
Sexually transmitted infections are a common cause of proctitis, particularly among people who have receptive anal intercourse. The hallmark symptom is often intense anorectal pain, sometimes with discharge or bleeding. Treatment targets the specific infection.
Gonorrhea is treated with a single injection of an antibiotic, typically given in one visit. Chlamydia requires a week-long course of oral antibiotics taken twice daily. Lymphogranuloma venereum, a more aggressive strain of chlamydia, needs a longer course of the same antibiotic for 21 days. Syphilis is treated with a penicillin injection. Herpes simplex requires antiviral medication taken orally for 7 to 10 days during a first episode, and people with recurring outbreaks may take daily suppressive therapy.
Since multiple infections can be present simultaneously, doctors often test for several STIs at once and may start treatment before all results come back. Sexual partners typically need treatment as well to prevent reinfection.
Radiation Proctitis Treatment
Radiation therapy for cancers of the prostate, cervix, or rectum can damage the rectal lining, sometimes causing chronic bleeding, pain, and urgency months or even years after treatment ends. Management focuses primarily on controlling rectal bleeding, which is the most common and troublesome symptom.
The most widely used procedure is argon plasma coagulation (APC), an endoscopic treatment where a jet of argon gas delivers a controlled electrical current to seal off bleeding blood vessels in the rectal wall. It stops or meaningfully reduces bleeding in 79% to 100% of patients. Most people need about two sessions, though some require up to five. Serious complications like fistulas or rectal narrowing occur in roughly 3% of patients.
Formalin application is another well-studied option with similar success rates. A diluted formaldehyde solution is applied directly to the damaged tissue during an endoscopic procedure, cauterizing the bleeding surface. In one study of 100 patients, bleeding stopped in 93% after an average of 3 to 4 applications spaced 2 to 4 weeks apart. Some patients experience rectal pain afterward.
Hyperbaric oxygen therapy, where you breathe pure oxygen in a pressurized chamber over a series of sessions, is another effective option that promotes tissue healing from the inside out. It’s particularly useful for patients with more diffuse radiation damage that extends beyond what endoscopic treatments can easily reach.
Diversion Proctitis Treatment
When surgery redirects the flow of stool away from a segment of the colon or rectum (as with a colostomy or ileostomy), the bypassed tissue can become inflamed because it’s no longer receiving short-chain fatty acids, the natural fuel produced when gut bacteria break down fiber. This is diversion colitis or proctitis.
If you have no symptoms, no treatment is needed beyond monitoring. For mild symptoms, enemas containing short-chain fatty acids can help nourish the starved tissue. The definitive treatment for severe cases is surgical reconnection, restoring the normal flow of stool through the affected segment.
Home Care for Symptom Relief
Regardless of the underlying cause, several comfort measures can ease day-to-day symptoms while treatment takes effect. Sitz baths are one of the most effective. Fill a bathtub or a plastic basin that fits over your toilet with 3 to 4 inches of warm water (around 104°F or 40°C) and soak for 15 to 20 minutes. The warmth relaxes the anal sphincter, improves blood flow to the tissue, and reduces pain and itching. You can do this three to four times a day during flare-ups. Skip the Epsom salts, oils, or other additives, as these can irritate already-inflamed tissue. Pat the area dry gently afterward rather than rubbing.
Dietary adjustments also help. Reducing spicy foods, caffeine, and alcohol can lower rectal irritation. Eating smaller, more frequent meals and staying well-hydrated keeps stools softer and easier to pass, which matters when your rectal lining is raw and inflamed.
What Happens if Proctitis Goes Untreated
Chronic, untreated proctitis can lead to open ulcers on the inner rectal lining. Over time, these ulcers can bore completely through the intestinal wall and create fistulas, which are abnormal tunnels connecting the rectum to surrounding structures like the skin, bladder, or vagina. Ongoing blood loss from inflamed or ulcerated tissue can also cause anemia, leaving you fatigued and short of breath. These complications are largely preventable with appropriate treatment, which is why getting a proper diagnosis and sticking with your treatment plan matters even when symptoms feel manageable.