Rectal pain has dozens of possible causes, ranging from a superficial tear in the skin that heals on its own to serious infections and, rarely, cancer. The challenge for both patients and clinicians is that many of these causes produce overlapping symptoms: sharp pain during bowel movements, a deep aching pressure, or sudden spasms that wake you at night. Because people often avoid discussing the problem out of embarrassment, rectal pain tends to go under-reported and under-treated. Understanding what the common causes actually are, which ones you can manage at home, and which ones demand prompt medical attention makes the topic far less intimidating than it first seems.
Anal Fissures and Why They Hurt So Much
An anal fissure is a small tear in the lining of the anal canal, and it is one of the most frequent reasons people experience sharp rectal pain. The pain is typically described as a cutting or tearing sensation during a bowel movement, sometimes followed by a throbbing ache that can last minutes to hours afterward. The skin in the anal canal is densely supplied with sensory nerve endings, which is why even a tiny split can produce pain out of proportion to the size of the wound. Fissures often develop after passing a hard or large stool, though they also occur with chronic diarrhea, childbirth, or any repetitive trauma to the area.
Most acute fissures heal within a few weeks with increased fiber intake, adequate water, and warm sitz baths. When a fissure becomes chronic, meaning it persists beyond about six to eight weeks, the internal anal sphincter tends to go into spasm, reducing blood flow to the tear and preventing healing. This is where topical medications become important. Systematic reviews of randomized trials show that calcium channel blocker ointments such as diltiazem heal roughly four out of five chronic fissures within about six weeks, compared to about a third healing with placebo. Nitroglycerin ointment also helps, healing around 63% of patients at eight weeks versus 38% on placebo.1Canadian Family Physician. Topical treatments for anal fissure Both medications work by relaxing the sphincter and restoring blood supply to the wound. If topical therapy fails, a minor surgical procedure to partially release the sphincter muscle is highly effective, though it carries a small risk of minor incontinence.
Anorectal Abscess and Fistula
An anorectal abscess is a pocket of pus that forms near the anus or rectum, usually because a small gland just inside the anal canal becomes blocked and infected. The pain is intense, constant, and often gets worse over days. Unlike the brief, movement-triggered pain of a fissure, abscess pain tends to be relentless, throbbing, and may be accompanied by fever or a visible swelling near the anus. Sitting becomes difficult, and the area is tender to the touch.
This type of infection is the most common form of what surgeons call anoperineal sepsis. The infected gland creates a tract that begins at the internal opening in the anal canal and extends outward, sometimes forming a secondary opening on the skin. Antibiotics alone do not cure it. The standard treatment is incision and drainage, ideally performed as soon as possible.2Annals of The Royal College of Surgeons of England. Cryptoglandular anal fistula In roughly a third to half of cases, the tract persists after drainage and becomes a fistula, a chronic tunnel between the anal canal and the skin. Fistulas produce intermittent drainage and can cause recurring bouts of pain until they are surgically addressed.
Sexually Transmitted Proctitis
Proctitis, or inflammation of the rectal lining, can be caused by sexually transmitted infections, particularly in people who have receptive anal intercourse. Gonorrhea, chlamydia, herpes simplex, and syphilis can all infect the rectum, producing pain, discharge, bleeding, and a frequent urge to have a bowel movement that produces little or no stool. Some of these infections can be present simultaneously, which complicates both diagnosis and treatment.3PubMed Central. Sexually transmitted proctitis
The symptoms of infectious proctitis can closely mimic inflammatory bowel disease or even a fissure, so a high degree of clinical suspicion is necessary for accurate diagnosis. A visual examination with an anoscope, combined with swab testing for specific pathogens, is typically needed. Treatment depends on the organism identified. The practical takeaway is that if you develop new rectal pain alongside discharge or an unusual urge to bear down, especially after unprotected anal sex, STI testing should be part of the workup rather than an afterthought.
Levator Ani Syndrome and Proctalgia Fugax
Not all rectal pain has an obvious structural explanation. Some people experience chronic, dull aching or pressure in the rectum that worsens with sitting and has no visible cause on examination. This pattern often falls under the diagnosis of levator ani syndrome, named after the broad sheet of pelvic floor muscle that forms the floor of the pelvis. The muscle essentially goes into chronic spasm or fails to relax properly, creating a sensation of a constant dull ache or heaviness deep in the rectum.
A related but distinct condition is proctalgia fugax, which presents as sudden, intense spasms of rectal pain lasting seconds to minutes and then vanishing completely. These episodes can wake people from sleep and are often frightening, but they tend to leave no lasting symptoms and no abnormal findings on examination. Both levator ani syndrome and proctalgia fugax are classified as functional anorectal pain disorders, meaning the pain is real but arises from how the muscles and nerves behave rather than from tissue damage or infection. There is considerable overlap between these conditions and other pelvic pain syndromes, including painful bladder conditions.4PubMed Central. Functional and chronic anorectal and pelvic pain disorders
For levator ani syndrome specifically, biofeedback therapy has shown strong results. In a randomized trial, biofeedback training helped the overwhelming majority of patients with a confirmed diagnosis regain the ability to relax the anal canal muscles during straining, and nearly all were able to evacuate normally afterward.5PubMed Central. Biofeedback is superior to electrogalvanic stimulation and massage for treatment of levator ani syndrome Biofeedback works by teaching patients to consciously control muscles they normally cannot feel or isolate. It outperformed both electrical stimulation and massage in that same trial, which is encouraging given how frustrating this diagnosis can be for patients who have been told nothing is structurally wrong.
Pelvic Floor Dyssynergia and Pudendal Neuralgia
Dyssynergic defecation is an acquired coordination problem in which the muscles of the pelvic floor contract when they should be relaxing during a bowel movement. Instead of the pelvic floor opening to allow stool to pass, it clamps down, creating a sensation of obstruction, straining, and sometimes pain. This affects up to half of all patients with chronic constipation.6PubMed Central. Diagnosis and Treatment of Dyssynergic Defecation The rectal pain in dyssynergia tends to be most noticeable during and just after attempted defecation, and it often coexists with a sense of incomplete evacuation. Biofeedback is again the first-line treatment, teaching the muscles to fire in the correct sequence.
Pudendal neuralgia is a nerve-related cause of chronic rectal, perineal, and genital pain. The pudendal nerve runs through the pelvis and supplies sensation to much of the area between the legs, including the rectum. When it becomes compressed or irritated, the result can be burning, stabbing, or aching pain that is typically worse with sitting and improves when standing or lying down. Diagnosis can be difficult because there is no simple blood test or imaging finding that confirms it. Clinicians rely on a set of clinical criteria, and patients often endure prolonged diagnostic odysseys before the condition is identified.7PubMed Central. Diagnostic Pain: A Case of Pudendal Neuralgia Treatment ranges from nerve blocks and physical therapy to, in refractory cases, surgical decompression of the nerve.
Endometriosis and Rectal Pain in Women
Endometriosis can cause rectal pain that many women and their doctors fail to connect to the underlying condition. When endometrial tissue implants on or near the rectum, the rectovaginal septum, or the posterior vaginal wall, it can produce dyschezia, meaning painful bowel movements, especially around menstruation. In a study of 360 women with deep infiltrating endometriosis, rectovaginal involvement was found in two-thirds of cases. Women with this involvement reported significantly higher pain scores during defecation than those without it, and the size of the endometriotic lesion correlated with pain severity.8PubMed. Dyschezia and posterior deep infiltrating endometriosis: analysis of 360 cases
What makes this cause easy to miss is that the pain may cycle with the menstrual period, which can lead women to dismiss it as “just cramps.” Clinicians who are not thinking about endometriosis might attribute the symptoms to irritable bowel syndrome or hemorrhoids. If you experience rectal pain that worsens predictably around your period, it is worth raising the possibility of deep endometriosis with your gynecologist. Diagnosis often requires imaging such as transvaginal ultrasound or MRI, and treatment may include hormonal therapy or surgical excision of the implants.
Coccyx Problems Masquerading as Rectal Pain
The coccyx, or tailbone, sits directly behind the rectum, and problems with it can produce pain that feels as though it originates inside the rectum rather than in the bone. Coccydynia, chronic tailbone pain, is a recognized cause of defecation pain, especially when a person is constipated or bearing down. The mechanism involves the coccyx moving abnormally during straining. In many cases the coccyx is subluxed or hypermobile, leading to chronic inflammation at its joints.9PubMed Central. Defecation pain and coccydynia due to an anteverted coccyx: a case report
The clue that the coccyx is involved rather than the rectum itself is usually tenderness on external palpation of the tailbone, pain worsened by sitting on hard surfaces, and improvement when sitting on a cushion with a cutout. This is a diagnosis that gets overlooked when doctors focus their examination on the anal canal and rectum alone. Dynamic imaging of the coccyx while sitting and standing can reveal the instability. Treatment includes specialized cushions, physical therapy, local steroid injections, and, in stubborn cases, surgical removal of the coccyx.
Solitary Rectal Ulcer Syndrome
Solitary rectal ulcer syndrome is an uncommon condition that produces rectal pain, bleeding, and mucus discharge. Despite its name, there can be more than one ulcer, and sometimes no ulcer at all, just a patch of abnormal-looking tissue. It is strongly associated with chronic straining during bowel movements and abnormal defecation behaviors such as excessive toilet visits and manual assistance to evacuate stool.10PubMed. Solitary rectal ulcer syndrome: physiology and treatment options The underlying issue is often an internal rectal prolapse, where the rectal wall folds in on itself during straining, causing repeated trauma to the mucosa.
Treatment begins with behavioral changes: reducing straining, managing constipation with fiber and adequate fluids, and breaking the habit of prolonged time on the toilet. Biofeedback can help retrain defecation mechanics. In cases where there is a significant associated prolapse, surgery may be needed. The condition can be mistaken for cancer on biopsy because the tissue changes look unusual under a microscope, which sometimes leads to unnecessary alarm before the diagnosis is clarified.
Radiation Proctitis
People who have undergone pelvic radiation therapy for cancers of the prostate, cervix, bladder, or rectum can develop radiation proctitis weeks to years after treatment. The acute form, appearing during or shortly after radiation, causes rectal pain, diarrhea, urgency, and bleeding. The chronic form is a different process entirely: progressive damage to the small blood vessels in the rectal wall leads to full-thickness tissue injury from poor blood supply.11Clinical Endoscopy. Radiation Proctitis and Management Strategies This chronic vascular damage can produce ongoing bleeding, pain, and, in severe cases, stricturing or fistula formation.
Treatment for chronic radiation proctitis often involves endoscopic therapies, such as argon plasma coagulation, to seal off fragile blood vessels. Sucralfate enemas, hyperbaric oxygen, and formalin application have all been used with varying success. The key point for anyone who has had pelvic radiation is that new rectal symptoms appearing months or even years later should prompt evaluation rather than being attributed to aging or diet.
Rectal Foreign Bodies
Foreign objects retained in the rectum are a recognized cause of acute rectal pain and a surprisingly common reason for emergency room visits. Objects that have been inserted and cannot be retrieved create pain from stretching of the rectal wall and from mucosal injury. In a case series reviewing management of rectal foreign bodies, one patient had perforation of the rectosigmoid junction, and four had lacerations of the rectal lining.12PubMed Central. Management of rectal foreign bodies Many objects can be removed in the emergency department under sedation, but those that have migrated higher, or that carry a risk of perforation, may require surgical intervention. The practical message is straightforward: seeking medical help promptly is safer than attempting home removal, and emergency departments handle this scenario routinely without judgment.
When Rectal Pain Signals Something Dangerous
Most rectal pain is caused by benign conditions, but certain features should prompt immediate evaluation. Unrelenting pain with fever and rapidly spreading redness or swelling in the perineal region can indicate a necrotizing soft-tissue infection such as Fournier’s gangrene, which is a surgical emergency. In patients with rectal cancer, this severe infection has been reported, and the diagnosis of cancer-related Fournier’s gangrene should be considered in anyone with blood on digital rectal examination combined with fever or sepsis of unknown origin and perianal symptoms.13PubMed Central. Rectal cancer and Fournier’s gangrene – current knowledge and therapeutic options
Other warning signs that warrant urgent assessment include:
- Unexplained weight loss: particularly when combined with a change in bowel habits or rectal bleeding, raising concern for colorectal malignancy.
- Severe, constant pain with fever: suggesting an abscess that may need drainage or a deeper pelvic infection.
- New fecal incontinence: which could indicate nerve compression from a mass or advanced pelvic floor damage.
- Profuse rectal bleeding: enough to cause lightheadedness or rapid heart rate, requiring emergency evaluation regardless of the suspected cause.
The point of listing these is not to alarm you. Most people with rectal pain have a fissure, hemorrhoids, or a muscle spasm that will resolve. But if any of the features above are present, waiting it out is riskier than a trip to the doctor.
Why So Many People Put Off Getting Help
Rectal pain occupies an unusual space in medicine. It is common enough that most primary care doctors see it regularly, yet patients delay seeking care more than they would for almost any other type of pain. Embarrassment is the most obvious barrier, but there is also a widespread assumption that rectal symptoms are always hemorrhoids and will go away on their own. While that assumption is often correct, it can also lead to missed fissures becoming chronic, abscesses progressing to fistulas, and STIs going untreated long enough to cause complications or transmission.
The examination itself is brief and usually less uncomfortable than people fear. A visual inspection and gentle digital examination are sufficient to diagnose most common causes. If the doctor suspects something beyond the reach of a finger exam, anoscopy or flexible sigmoidoscopy can be done in an office setting with minimal preparation. The diagnostic process is targeted and efficient once you walk through the door. A reasonable self-management window for mild, new-onset rectal pain with no red flags is about two weeks of increased fiber, warm baths, and over-the-counter pain relief. If symptoms persist past that point, or worsen at any time, an evaluation is the next step.