Proctitis: Causes and Symptoms

Proctitis is inflammation of the lining of the rectum, and it’s a symptom pattern with several different possible causes — not a single disease. It’s included here because its symptoms overlap heavily with hemorrhoids, but the right treatment depends entirely on identifying what’s actually causing the inflammation.

Key takeaways

Common symptoms include rectal pain or discomfort, a persistent urge to have a bowel movement even when the rectum is empty (tenesmus), bleeding, and mucus discharge.
Causes range from infections (including sexually transmitted infections) to inflammatory bowel disease to prior radiation treatment — each treated differently.
Diagnosis typically requires a doctor to look inside the rectum (sigmoidoscopy or similar), not just an external exam.

Common symptoms

Rectal pain, discomfort, or a feeling of fullness
A frequent or persistent urge to have a bowel movement, even shortly after one (tenesmus)
Rectal bleeding, often mixed with mucus
Discharge
In some cases, pain during bowel movements

Several of these — bleeding, discomfort, mucus — are also reported with hemorrhoids, which is why proctitis is easy to misattribute at first.

What causes it

Proctitis isn’t one disease — it’s a description of inflammation that can come from several different sources, including:

Infections, including some sexually transmitted infections (see STIs presenting anally)
Inflammatory bowel disease — ulcerative colitis frequently involves the rectum, and Crohn’s disease can as well
Radiation treatment — proctitis can develop as a side effect of radiation therapy for pelvic cancers, sometimes appearing months to years after treatment (see Radiation proctitis)
Antibiotic-associated inflammation in some cases
Less commonly, other inflammatory or autoimmune processes

Because the underlying cause varies so much, “proctitis” on its own isn’t a complete diagnosis — it’s a starting point that leads to figuring out which of these is actually responsible in a given case.

Why the cause matters more than the symptom pattern here

Two people with what looks like the same symptoms — rectal discomfort, urgency, some bleeding — could need entirely different treatment depending on cause: an antibiotic course for a bacterial infection, IBD-specific treatment for colitis-related proctitis, or a different management approach for radiation-related changes. Treating the symptom the way you’d treat a hemorrhoid (fiber, sitz baths, topical creams) may offer some comfort but won’t address an infection or ongoing inflammation.

How it’s diagnosed

Because the inflammation is inside the rectum rather than at the anal opening, an external visual exam alone often isn’t enough. Diagnosis typically involves a closer look inside the rectum — commonly a flexible sigmoidoscopy — sometimes along with tests for specific infections, stool studies, or biopsies depending on what’s suspected.

When to see a doctor

Persistent rectal discomfort, urgency, or discharge that isn’t explained by a hemorrhoid or fissure you’ve already had checked
Any of these symptoms following radiation treatment to the pelvic area
Symptoms alongside recent new sexual partners or known STI exposure
Bleeding or discomfort that continues despite hemorrhoid-focused self-care

Think this might be related to IBD specifically? See Ulcerative colitis and rectal bleeding or Crohn’s disease and perianal symptoms.

This page is for general education. Proctitis has multiple possible causes that require different tests and treatments — it can’t be diagnosed or treated based on symptoms alone.