Rectal pain most commonly comes from hemorrhoids or anal fissures, but the list of possible causes ranges from brief muscle spasms to chronic inflammatory conditions. The cause usually determines whether the pain is sharp, dull, constant, or tied to bowel movements, so understanding the pattern of your pain is the fastest way to narrow down what’s going on.
Hemorrhoids
Hemorrhoids are swollen veins in the anal and rectal area, caused by repeated pressure from straining, sitting for long periods, or chronic constipation. Internal hemorrhoids often cause no pain at all. The main sign is bright red blood on toilet paper or dripping into the bowl after a bowel movement. External hemorrhoids are the ones that hurt. They form under the skin around the anus and can produce a tender lump, itching, and mucus discharge. When a blood clot forms inside an external hemorrhoid (a thrombosed hemorrhoid), the pain can be sudden and intense.
Hemorrhoids generally last several days and often recur. Most resolve on their own with increased fiber, adequate water intake, and warm sitz baths. If a thrombosed hemorrhoid is caught within the first 48 to 72 hours, a clinician can remove the clot in a quick office procedure for faster relief.
Anal Fissures
An anal fissure is a small tear in the lining of the anal canal, usually caused by passing a hard or large stool. The hallmark is sharp, cutting pain during a bowel movement that can be followed by throbbing for several hours afterward. You may also notice blood on the toilet paper or on the surface of the stool. This pattern of pain specifically triggered by bowel movements, then lingering afterward, is what distinguishes fissures from most other causes.
Acute fissures often heal within a few weeks with home care: stool softeners, fiber supplements, and sitz baths. A fissure that persists beyond six to eight weeks is considered chronic. At that point, prescription ointments that relax the anal sphincter can help. If a chronic fissure resists all other treatments, surgery is the most effective option and has a high success rate.
Perianal Abscess and Fistula
A perianal abscess is a pocket of pus that forms near the anus, typically from an infected gland. It causes constant, throbbing pain that worsens with sitting, along with swelling, redness, and sometimes fever. The pain tends to build over days rather than appearing suddenly during a bowel movement.
Between 30% and 70% of patients with an anorectal abscess already have a fistula, an abnormal tunnel between the anal canal and the skin, at the time of diagnosis. For those who don’t initially have one, roughly a third will develop a fistula in the months to years after the abscess is drained. Fistulas cause recurring cycles of swelling, pressure, pain, and spontaneous drainage of pus or blood-tinged fluid. Both conditions typically require procedural treatment rather than antibiotics alone.
Proctitis
Proctitis is inflammation of the rectal lining. It produces a deep, aching rectal pain along with urgency, the frequent feeling that you need to have a bowel movement, and sometimes mucus or bloody discharge. The causes fall into a few categories:
- Sexually transmitted infections: Gonorrhea, chlamydia, herpes, and lymphogranuloma venereum can all infect the rectum, particularly through receptive anal sex. STI-related proctitis is one of the most common infectious causes.
- Inflammatory bowel disease: Ulcerative colitis and Crohn’s disease can both inflame the rectum. In ulcerative colitis, the rectum is almost always involved. Crohn’s can affect any part of the digestive tract but frequently targets the end of the colon and rectum.
- Radiation: Pelvic radiation therapy for cancers of the prostate, cervix, or rectum can damage the rectal lining, sometimes causing symptoms months or years after treatment ends.
Treatment depends entirely on the underlying cause. Infectious proctitis clears with the right antibiotics or antivirals. Inflammatory bowel disease requires ongoing management with anti-inflammatory medications.
Muscle Spasm Syndromes
Two conditions cause rectal pain from involuntary clenching of the pelvic floor muscles, with no visible injury or disease on examination.
Proctalgia fugax produces sudden, sharp pain in the anus or lower rectum that lasts anywhere from a few seconds to about 30 minutes, then disappears completely. In a study of 148 patients, the pain lasted less than one minute in 57% of cases and occurred fewer than five times a year in about half. Episodes often strike without warning, sometimes at night, and can be associated with stress or anxiety. Between episodes, there is no pain at all.
Levator ani syndrome is the chronic version. The pain is dull, aching, and constant or frequently recurring, with episodes lasting 20 minutes or longer. Many people describe a sensation of pressure or sitting on a ball. On examination, the pelvic floor muscles are often overly tight and tender. The condition is diagnosed after other causes of rectal pain have been ruled out and symptoms have been present for at least 12 weeks. Treatment typically involves physical therapy focused on relaxing the pelvic floor muscles, sometimes combined with biofeedback.
Tailbone Pain Mimicking Rectal Pain
Coccydynia, or tailbone pain, sits close enough to the rectum that it can feel like the pain is coming from inside the rectal area. The key difference is that coccydynia worsens with sitting, especially on hard surfaces, and improves when you stand. It’s often triggered by a fall, prolonged sitting, or childbirth rather than by bowel movements. Pelvic floor muscle tension can also refer pain to the coccyx region, blurring the line between the two. Lumbar disc problems can occasionally send pain to the same area. If your rectal pain is worse with sitting but unrelated to bowel movements, the source may be musculoskeletal rather than rectal.
Anal Cancer
Anal cancer is rare, accounting for less than 2% of all gastrointestinal malignancies. In the United States, the incidence is about 1.9 per 100,000 people. But it deserves mention because its symptoms, rectal pain and bleeding, overlap heavily with hemorrhoids and fissures. Most patients with anal cancer initially present with symptoms that look like a benign condition. Some have no symptoms at all.
What raises the index of suspicion is pain or bleeding that doesn’t follow the expected pattern: it doesn’t improve with standard hemorrhoid or fissure treatments, it’s accompanied by a lump that’s growing, or there’s unexplained weight loss. Risk factors include HPV infection, a history of receptive anal sex, immunosuppression, and smoking. Persistent or unexplained symptoms warrant further evaluation, typically starting with a visual examination and anoscopy.
When Rectal Pain Needs Urgent Attention
Most rectal pain resolves with basic care or turns out to be something manageable. But certain combinations signal a problem that needs same-day evaluation: a large amount of rectal bleeding, especially if accompanied by dizziness or feeling faint; rectal pain that rapidly worsens or spreads; and pain paired with fever, chills, or discharge from the anal area. These patterns can indicate a significant abscess, severe bleeding, or an infection that’s spreading.