Hemorrhoids on their own rarely interfere with urination in a direct, mechanical way, but the overlap between the two problems is real and more common than most people expect. Roughly a quarter to a third of patients with chronic anal pain also report urinary symptoms, and the connection runs through shared nerves, pelvic floor muscles, and conditions like chronic constipation that fuel both problems at once. The situations where hemorrhoids most clearly trigger urinary trouble are after surgery or procedures, and in older men whose enlarged prostate may be quietly driving both issues.
How Hemorrhoids and the Bladder Share Real Estate
The rectum and the bladder sit remarkably close to each other in the pelvis, separated by only a thin layer of tissue. They also share nerve pathways running through the sacral spinal cord, particularly the S2 through S4 nerve roots. These nerves control both rectal sensation and bladder function, which is why severe rectal pain or inflammation can spill over into urinary symptoms. When those sacral nerve roots are irritated or compressed, the result can range from bladder hypersensitivity and urgency to outright urinary retention, where you simply cannot empty your bladder.
This shared wiring explains a pattern that puzzles many patients: a flare-up of hemorrhoid pain sometimes coincides with needing to urinate more frequently, or with difficulty getting the stream started. The hemorrhoids themselves are not blocking the urethra. Instead, the intense pain and swelling in the anal canal trigger reflexive tightening of the pelvic floor muscles, which wrap around both the anal canal and the urethra. When those muscles clamp down in response to pain, they can squeeze the urethra shut or keep the bladder from contracting normally.
The Constipation Connection
Constipation is probably the single biggest shared driver of both hemorrhoids and urinary problems. Chronic straining on the toilet is one of the top risk factors for developing hemorrhoids in the first place, and the same loaded, distended rectum that results from constipation can physically compress the bladder outlet and urethra. Research on patients undergoing prostate biopsy found that rectal distention in constipated patients compresses the bladder outlet, impairing bladder emptying and raising the risk of acute urinary retention.
This matters because many people who show up with hemorrhoid symptoms also have underlying constipation they may not fully recognize. If you are dealing with both hemorrhoids and a weak or hesitant urinary stream, the constipation itself is often the culprit driving both complaints. Treating the constipation with fiber, adequate fluid intake, and stool softeners can improve both problems simultaneously. In children, the link is even more striking: constipation increases the likelihood of urinary incontinence, bladder overactivity, poorly coordinated voiding, and recurrent urinary tract infections.
Urinary Retention After Hemorrhoid Surgery
The clearest, most well-documented scenario where hemorrhoids lead to urinary trouble is after hemorrhoidectomy, the surgical removal of hemorrhoids. Urinary retention, meaning the inability to urinate and the need for a catheter, is one of the most common complications of this surgery. In a large study of over 2,100 patients, about 14 percent developed urinary retention after hemorrhoidectomy.
Several factors raise the risk. In that same study, males were about 1.5 times more likely to develop retention than females, older patients faced roughly 1.6 times higher odds, and those with a higher body mass index were at increased risk as well. Having four or more hemorrhoids removed raised the odds by nearly 50 percent, and patients who needed postoperative pain medication had about twice the risk of retention compared to those who did not.
Another study found a somewhat different risk profile, identifying female sex, pre-existing urinary symptoms, diabetes, heavy use of postoperative painkillers, and removal of more than three hemorrhoids as independent predictors of retention after surgery for anorectal disease. The type of anesthesia also matters: sacral (spinal) anesthesia and receiving more than 700 milliliters of intravenous fluid during the procedure were both linked to significantly higher retention rates in one analysis.
The takeaway for anyone facing hemorrhoid surgery is that temporary difficulty urinating afterward is common enough to be considered a known risk rather than a rare complication. Your surgical team should be aware of your baseline urinary function, and strategies like limiting IV fluids, managing pain carefully, and early mobilization can help reduce the odds.
What Happens After Nonsurgical Hemorrhoid Procedures
It is not just full surgery that can cause urinary problems. Rubber band ligation, one of the most common office procedures for internal hemorrhoids, carries its own small risk. In a study of over 500 patients who underwent banding, about 2.5 percent required hospitalization for complications. Among those hospitalized, three patients developed urinary retention along with pain and fever, and one additional patient experienced difficulty urinating due to prolapsed thrombosed hemorrhoids after the procedure. These numbers are small, but they are worth knowing about, especially if you develop pelvic pain or trouble urinating in the days following a banding procedure, as that combination can signal a more serious complication like a perianal abscess that needs prompt treatment.
The Prostate and Hemorrhoid Overlap in Older Men
For men over about 50, there is a particularly interesting relationship between hemorrhoids and urinary symptoms that runs in the opposite direction from what most people assume. Rather than hemorrhoids causing urinary problems, an enlarged prostate may be causing both. Benign prostatic hyperplasia, or BPH, leads to increased straining during urination and often during bowel movements as well. The chronic pelvic congestion and venous pressure that accompany an enlarged prostate can promote hemorrhoid formation.
A prospective study that screened 62 elderly men with BPH found that 25 of them, roughly 40 percent, had hemorrhoids before prostate surgery. Three months after prostatectomy, 80 percent of those hemorrhoids had regressed on their own without any hemorrhoid-specific treatment. The researchers concluded that in elderly men, the presence of hemorrhoids may actually be a sign of underlying prostate enlargement rather than an independent problem. A more recent Indian study found similar baseline numbers, with 42 percent of BPH patients having hemorrhoids at the time of enrollment.
This has a practical implication that catches many men off guard. If you are an older man dealing with both hemorrhoids and a sluggish urinary stream, nocturia, or a feeling of incomplete bladder emptying, the urinary symptoms are not being caused by the hemorrhoids. Both problems likely trace back to the prostate, and treating the prostate issue may resolve or improve both. Getting rubber band ligation or hemorrhoidectomy without addressing the prostate would be treating a downstream effect while ignoring the source.
Chronic Anal Pain and Bladder Symptoms
People with chronic anal pain, whether from hemorrhoids, fissures, or less easily explained causes, report urinary problems at rates that are hard to ignore. A study of 96 patients with chronic idiopathic anal pain found that about 28 percent had associated urinary disorders. Among those whose pain did not fit the classic pattern of brief, fleeting episodes, nearly half reported urinary symptoms. Pain that radiated beyond the anal area was common too, affecting about a third of patients, and more than half had some form of bowel dysfunction alongside their urinary complaints.
The mechanism here is not mysterious. Chronic pain in the pelvis tends to create a vicious cycle: the muscles of the pelvic floor tighten in response to pain, which can compress the urethra and irritate the bladder, which creates more discomfort, which tightens the muscles further. Anyone who has tried to urinate while in severe pain from a thrombosed hemorrhoid understands this instinctively. The pain does not have to be in the bladder to affect the bladder, because the muscles responsible for continence and voiding span the entire pelvic floor.
Pelvic Floor Dysfunction as the Shared Thread
A growing body of research frames both hemorrhoid symptoms and urinary dysfunction as different expressions of the same underlying pelvic floor problem. A study on detrusor underactivity, a condition where the bladder muscle does not contract strongly enough to empty properly, found that female patients with this condition had a higher prevalence of hemorrhoids alongside vaginal bulging, recurrent pelvic organ prolapse, and inguinal hernia. In other words, the weak or uncoordinated pelvic floor that allows hemorrhoids to prolapse is the same dysfunctional floor that leads to incomplete bladder emptying.
One study of women without urinary incontinence found that a history of hemorrhoids was associated with higher scores on a urinary symptom questionnaire, meaning more frequent or bothersome lower urinary tract symptoms even in the absence of a clear diagnosis of incontinence. This suggests that even when hemorrhoids are not directly “causing” urinary problems, the two conditions share enough underlying biology that having one should prompt a conversation about the other.
Pelvic floor physiotherapy has shown benefits for both bladder dysfunction and bowel dysfunction, including constipation and fecal incontinence. Biofeedback-assisted pelvic floor training appears to work better than muscle exercises alone, and electrical stimulation can further improve results. For someone dealing with both hemorrhoid symptoms and urinary complaints, a referral to a pelvic floor physical therapist may address the root cause more effectively than treating each symptom in isolation.
When Warm Sitz Baths Do Double Duty
Warm sitz baths are a staple home remedy for hemorrhoid flares, but they may also help with urinary retention, and there is actual evidence behind the effect. Researchers observed that the rate of spontaneous urination increased in patients with urinary retention after hemorrhoidectomy when they were placed in warm sitz baths, even though bladder pressure and the electrical activity of the external urethral sphincter did not change significantly. The proposed explanation is what has been called a thermosphincteric reflex: warm water triggers relaxation of the internal urethral sphincter, which in turn allows the bladder to contract and urination to begin.
This is worth knowing about for two reasons. First, if you are recovering from hemorrhoid surgery and having trouble urinating, a warm sitz bath is one of the simplest things you can try before resorting to catheterization. Second, during a painful hemorrhoid flare-up at home, a sitz bath may ease both the anal discomfort and any associated urinary hesitancy by relaxing the entire pelvic floor and internal sphincter complex at once.
Children and the Constipation-Bladder-Hemorrhoid Triangle
In pediatric medicine, the connection between constipation and bladder problems is well established and tends to be more dramatic than in adults. Constipation in children raises the likelihood of urinary incontinence, overactive bladder symptoms, poorly coordinated voiding patterns, and recurrent urinary tract infections. While hemorrhoids are uncommon in children, when they do occur they almost always point to severe, chronic constipation, which means the same child is also at elevated risk for these bladder problems.
Parents often do not connect the dots between their child’s bedwetting or daytime accidents and their bowel habits. Pediatric urologists routinely screen for constipation before investigating other causes of urinary incontinence in children, and resolving the constipation frequently improves or eliminates the urinary symptoms without any bladder-specific treatment.
Red Flags That Warrant Urgent Attention
Most of the time, mild urinary symptoms during a hemorrhoid flare are annoying but not dangerous. There are situations, however, where the combination of rectal symptoms and urinary problems signals something more serious:
- Complete inability to urinate: If you cannot pass any urine for several hours and feel increasing pressure in your lower abdomen, this is acute urinary retention and requires emergency evaluation. It can happen after hemorrhoid surgery, after a banding procedure, or during a severe thrombosed hemorrhoid episode.
- Fever with rectal pain and urinary trouble: This combination after any hemorrhoid procedure can indicate a perianal or pelvic abscess, which needs antibiotics and possibly drainage.
- New urinary symptoms in an older man with hemorrhoids: As discussed, this pattern often points to an enlarged prostate rather than the hemorrhoids themselves. A prostate evaluation is warranted.
- Progressive weakness or numbness in the saddle area: If urinary retention accompanies numbness around the genitals, perineum, or inner thighs along with rectal symptoms, this could indicate cauda equina syndrome, a rare but serious neurological emergency involving compression of the nerve roots at the base of the spine.
The distinction between “my hemorrhoids are making it a bit harder to pee” and “I need to see someone today” usually comes down to whether you can still urinate at all, whether you have a fever, and whether you notice any neurological changes like numbness or leg weakness. Mild hesitancy or increased frequency during a flare-up is common and expected. Complete retention, high fever, or neurological symptoms are not.
Why Women and Men Experience This Differently
The research on urinary retention after hemorrhoid surgery sends mixed signals about which sex is at higher risk. One study of over 2,100 patients found that men were at significantly higher risk, with 1.5-fold greater odds than women. Another study identified female sex as an independent risk factor for post-surgical retention. The apparent contradiction likely reflects differences in the study populations, the specific surgical techniques used, and the types of anesthesia administered. Women have a shorter urethra and different pelvic anatomy, which might make them more susceptible to retention under certain anesthetic conditions, while men’s longer urethra and the proximity of the prostate to the surgical field create a different set of vulnerabilities.
Outside the surgical context, women face their own version of the hemorrhoid-urinary overlap during pregnancy and the postpartum period. Pregnancy is one of the leading causes of both new hemorrhoids and new urinary symptoms, driven by the weight of the uterus on pelvic structures, hormonal changes that relax smooth muscle and venous walls, and the direct trauma of vaginal delivery. A study of continent women, those without diagnosed incontinence, found that a history of hemorrhoids was independently associated with worse lower urinary tract symptom scores. In postpartum women dealing with both hemorrhoids and urinary leakage or urgency, pelvic floor rehabilitation addresses both complaints through the same exercises.
Medications That Can Make Things Worse
Several medications commonly used to treat hemorrhoid pain can independently worsen urinary function. Opioid painkillers are the biggest offender. Opioids reduce bladder contractility and increase sphincter tone, making it harder to initiate and complete urination. This is why postoperative analgesic use consistently shows up as a risk factor for urinary retention after hemorrhoidectomy in study after study. If you have a history of urinary hesitancy or an enlarged prostate, even a short course of opioids for hemorrhoid pain can tip you into retention.
Over-the-counter antihistamines and decongestants, which some people take for unrelated reasons during a hemorrhoid flare, also have anticholinergic effects that can impair bladder emptying. The combination of painful hemorrhoids, a tight pelvic floor, and a medication that weakens bladder contractions can create a perfect storm for urinary retention even without surgery being involved.
Non-opioid pain management, including topical treatments, nonsteroidal anti-inflammatory drugs, and warm sitz baths, avoids this urinary side effect entirely and is generally preferred for hemorrhoid pain management when possible.