Hemorrhoids create a painful feedback loop that makes bowel movements difficult through three overlapping mechanisms: swollen tissue physically narrows the anal canal, pain triggers the internal anal sphincter to clamp down involuntarily, and your brain learns to dread the act, prompting you to delay trips to the bathroom. That delay hardens stool, which then injures the hemorrhoids further on its way out. The result is a cycle that can feel impossible to break, but understanding what is actually happening inside the canal makes the problem far more solvable than it seems.
How Hemorrhoids Physically Block the Exit
Hemorrhoids are not new growths. Everyone has cushions of blood-vessel-rich tissue lining the anal canal; they help with fine-tuned continence. The problem starts when those cushions swell, slide downward, or develop structural damage to the tiny muscles and blood vessels that hold them in place. In advanced hemorrhoids, ultrasound imaging reveals a “mosaic pattern” of disrupted tissue, with dilated veins, arteriovenous fistulas, and distorted supporting muscle fibers.1PubMed Central. Sonographic appearance of anal cushions of hemorrhoids Those bulging, engorged cushions take up space. When stool tries to pass through a canal that is already partially occupied by swollen tissue, the passage is tighter, slower, and more painful.
External hemorrhoids sit just outside the anal opening, and when they are inflamed or thrombosed (filled with a blood clot), even the final moment of passing stool becomes agonizing. Internal hemorrhoids that have prolapsed, meaning they protrude out of the canal, create a physical obstacle plus a sensation of incomplete emptying. You may feel like there is more stool to pass when what you are actually sensing is the hemorrhoid itself. That false signal can keep you straining longer than necessary, which makes everything worse.
Pain, Spasm, and the Sphincter’s Overreaction
The internal anal sphincter is a ring of smooth muscle that stays contracted most of the time to maintain continence. During a normal bowel movement, it relaxes to let stool pass. But when hemorrhoids are inflamed or when the anal lining is raw and irritated, the sphincter does the opposite of what you need: it goes into spasm. This involuntary clenching is your body’s protective reflex against pain, but it effectively locks the door shut just when you are trying to open it.
This sphincter spasm is well-documented as a significant contributor to difficulty with defecation in hemorrhoid patients. Research into post-hemorrhoidectomy pain identifies internal anal sphincter spasm as a major factor, and the same mechanism operates when hemorrhoids are still present and untreated.2PubMed Central. Can Targeting Sphincter Spasm Reduce Post-Haemorrhoidectomy Pain? A Systematic Review and Meta-Analysis The spasm raises anal resting pressure, and that elevated pressure both makes it harder to evacuate stool and reduces blood flow to the already-damaged hemorrhoid tissue, slowing healing.
Topical medications can interrupt this cycle. Applied directly to the anal canal, diltiazem gel at a 2% concentration produced roughly a 28% drop in anal pressure, and bethanechol gel achieved about a 24% reduction, with effects lasting three to five hours.3PubMed Central. Topical diltiazem and bethanechol decrease anal sphincter pressure without side effects By chemically relaxing the sphincter, these treatments allow stool to pass with less force and less pain. If you have been prescribed a “muscle relaxant” cream for hemorrhoids, this is what it is doing.
The Vicious Cycle Between Constipation and Hemorrhoids
One of the most frustrating aspects of hemorrhoids is that constipation both causes them and results from them. A meta-analysis comparing hemorrhoid patients to controls found that constipation was about twice as common in people with hemorrhoids.4European Journal of Gastroenterology & Hepatology. Functional constipation in patients with hemorrhoids: a systematic review and meta-analysis The relationship runs in a circle: hard, dry stool requires more straining, straining engorges the hemorrhoidal cushions, the engorged cushions cause pain, pain triggers stool avoidance, avoidance leads to harder stool, and the loop repeats.
Beyond the physical mechanics, there is a straightforward behavioral component. When you know that a bowel movement is going to hurt, you postpone it. You might ignore the urge, wait for a “better time,” or consciously clench to hold stool back. Every hour you delay, the colon continues absorbing water from the stool, making it drier and more compact. By the time you finally sit down, what you are trying to pass is harder, larger, and far more likely to tear delicate tissue on its way out. This stool-withholding behavior is not a character flaw; it is a rational response to pain. But it makes the problem dramatically worse.
Dyssynergic Defecation and the Muscles That Work Against You
Some people with hemorrhoids have an additional, less obvious problem: the muscles involved in defecation are not coordinating properly. During a normal bowel movement, the pelvic floor muscles and the external anal sphincter are supposed to relax while the abdominal muscles push. In dyssynergic defecation, those muscles contract when they should be relaxing, creating the equivalent of trying to push something out through a door that someone is pulling shut from the other side.
A study measuring anorectal pressures in patients with hemorrhoids, anal fissures, and solitary rectal ulcer syndrome found that functional evacuation disorders were common across all three conditions. In the group studied, dyssynergic defecation was present in a substantial share of hemorrhoid patients, with abnormal balloon expulsion (a test where you try to push a small inflated balloon out of the rectum) also significantly elevated.5PubMed. Fecal evacuation disorders in anal fissure, hemorrhoids, and solitary rectal ulcer syndrome The takeaway is that hemorrhoids may not be the only reason you are struggling. If dietary changes and topical treatments are not helping, the coordination of the muscles themselves may need attention.
Biofeedback therapy, which uses sensors to show you in real time whether your pelvic floor muscles are contracting or relaxing, has demonstrated efficacy for chronic constipation tied to dyssynergic defecation. Studies suggest it works better than pelvic floor exercises alone.6PubMed Central. Biofeedback for Pelvic Floor Disorders If you have hemorrhoids and chronic difficulty with evacuation that does not respond to fiber and stool softeners, asking your doctor about anorectal manometry testing is worth the conversation. It can reveal whether dyssynergia is part of your picture.
Fiber, Fluids, and Softening the Stool
The single most effective thing you can do to make bowel movements easier with hemorrhoids is to make the stool itself softer and easier to pass. This is not a sexy answer, but the evidence behind it is strong. A meta-analysis of fiber supplementation in hemorrhoid patients found that the risk of symptoms persisting dropped by about half in the fiber group compared to controls, and the risk of bleeding fell by a similar margin.7American Journal of Gastroenterology. Fiber for the Treatment of Hemorrhoids Complications: A Systematic Review and Meta-Analysis The benefits held up at both six-week and three-month follow-ups.
The mechanism is straightforward. Fiber absorbs water in the colon and creates bulkier, softer stool that passes with less straining. Less straining means less pressure on the hemorrhoidal cushions, less engorgement, and less pain. Combined with adequate fluid intake and moderate physical activity, a fiber-rich diet addresses the mechanical stress that drives the hemorrhoid-constipation cycle.8Journal of Education, Health and Sport. Hemorrhoidal Disease – The Role of Dietary, Behavioral and Lifestyle Factors in Prevention and Conservative Management
A few practical notes: increase fiber gradually. Jumping from a low-fiber diet to 30 grams a day overnight tends to produce bloating and gas that makes you even less inclined to sit on the toilet. Add one extra serving of vegetables, legumes, or a fiber supplement every few days and let your gut adapt over two to three weeks. Drink more water than you think you need, since fiber without fluid can actually make constipation worse. And if whole-food fiber is not enough, psyllium husk supplements are the best-studied option and are available without a prescription.
Posture on the Toilet
The standard Western sitting position on a toilet places your body at roughly a 90-degree angle at the hips. In that posture, a bend in the rectum called the anorectal angle stays partially closed, meaning you have to push harder to get stool past it. Squatting opens that angle significantly, straightening the path and allowing gravity to do more of the work. A scoping review of toilet posture and health outcomes found that squatting may reduce digestive strain and enhance bowel evacuation, while standard sitting positions may increase bowel-related difficulties.9PubMed Central. Sitting vs. squatting: a scoping review of toilet postures and associated health outcomes
You do not need to replace your toilet. A simple footstool that raises your knees above your hips while you sit approximates a squatting posture and straightens the anorectal angle. Research into ergonomic toilet stools confirms that these devices promote a healthier defecation posture when used with a conventional sitting toilet.10International Journal of Research and Innovation in Social Science. Design and Ergonomic Assessment of an Ergonomic Toilet Stool for Promoting Healthier Defecation Posture For someone with hemorrhoids, this is a low-cost, no-risk change that can meaningfully reduce the amount of straining required per bowel movement. Lean forward slightly, rest your forearms on your thighs, and let your belly relax rather than bearing down hard.
When Conservative Measures Are Not Enough
Fiber, fluids, posture adjustments, and topical treatments work well for most people with mild to moderate hemorrhoids. But if you have large internal hemorrhoids that prolapse, or if symptoms persist despite months of lifestyle changes, procedural options exist that address the hemorrhoids directly and often resolve the defecation difficulty along with them.
Rubber band ligation is the most common office-based procedure for internal hemorrhoids. A large case series of 750 patients treated with banding found a cure rate of about 93%, with no significant difference in outcomes between moderate and more advanced internal hemorrhoids.11PubMed Central. Rubber band ligation for 750 cases of symptomatic hemorrhoids out of 2200 cases Complications were uncommon and did not require hospitalization. A randomized trial comparing two endoscopic banding techniques found comparable efficacy for bleeding, prolapse, pain, and constipation symptoms.12PubMed. Efficacy of two endoscopic rubber band ligation methods for symptomatic hemorrhoids: a randomized controlled trial
When banding is compared directly to surgical hemorrhoidectomy for grade 2 and 3 internal hemorrhoids, both approaches show similar effectiveness for bleeding control (around 93-95%) and prolapse resolution (around 96-97%), with comparable one-year recurrence rates near 30%. The major advantage of banding is significantly less pain, faster recovery, and less time away from work.13UHD Journal of Science and Technology. Surgery Versus Flexible Endoscopic Rubber Band Ligation for Grade 2 and 3 Internal Hemorrhoids For someone whose main complaint is difficulty with defecation, this matters: a procedure that resolves the hemorrhoids with minimal post-operative pain means less sphincter spasm during recovery and a quicker return to normal bowel function.
Surgical hemorrhoidectomy remains the most definitive treatment for very large or complicated hemorrhoids, but it comes with a significant post-operative pain burden. That pain, driven partly by internal sphincter spasm, can temporarily make defecation even harder than it was before surgery. About 14% of patients in one large study developed urinary retention after hemorrhoidectomy, a complication linked to the pelvic pain response, with men, older adults, and those with higher body mass at elevated risk.14PubMed Central. Predictors of postoperative urinary retention after semiclosed hemorrhoidectomy The post-surgical constipation is temporary, but it is worth being prepared for it and having a stool-softening regimen already in place before the procedure.
Hemorrhoids During Pregnancy
Pregnancy creates a perfect storm for hemorrhoid-related constipation. Rising progesterone levels slow gut motility, the expanding uterus puts direct pressure on pelvic veins and the rectum, blood volume increases, and iron supplements (commonly prescribed for pregnancy) are constipating on their own. Many pregnant people develop hemorrhoids for the first time during the third trimester or during delivery itself. The physiological changes of pregnancy that predispose both constipation and hemorrhoids are well-documented and largely unavoidable, though they can be managed.15Gastroenterology Clinics of North America. Constipation, Hemorrhoids, and Diarrhea in Pregnancy
Treatment options during pregnancy are more limited because many medications are not studied in pregnant populations. Fiber supplementation, adequate hydration, and gentle physical activity remain the first-line approach. Topical hemorrhoid creams are generally considered safe for short-term use, but it is worth confirming with your provider which specific product is appropriate. A footstool for toilet posture can be especially helpful during the third trimester, when abdominal pressure is highest and the urge to strain is strongest. Most pregnancy-related hemorrhoids improve considerably within a few weeks after delivery as hormone levels normalize and pelvic pressure decreases.
When Difficulty Pooping Becomes Dangerous
For most people, the difficulty with defecation caused by hemorrhoids is painful and frustrating but not medically dangerous. There is, however, a point where chronic stool retention crosses into a condition called fecal impaction, where a hard mass of stool becomes lodged in the rectum and cannot be passed on its own. This is more common in older adults, people with mobility limitations, and those taking opioid pain medications. Fecal impaction carries real risks, including bowel obstruction, ulceration of the rectal wall, and in rare cases perforation.16PubMed Central. Fecal impaction: a cause for concern?
Warning signs that you should seek medical attention rather than continuing to manage at home include: no bowel movement at all for more than a week despite stool softeners; rectal bleeding that is heavy, dark, or mixed with the stool rather than just on the toilet paper; severe abdominal pain or distension; nausea and vomiting alongside inability to pass stool; and any new symptoms like unexplained weight loss or a change in stool caliber (pencil-thin stools), which could signal something other than hemorrhoids entirely. Hemorrhoids are extremely common and usually benign, but they share symptoms with conditions that are not, and a doctor visit is the only way to distinguish them.
Time on the Toilet and the Smartphone Problem
One under-discussed contributor to the hemorrhoid-constipation cycle is simply how long people sit on the toilet. The anal cushions are designed to be compressed briefly during defecation, not for extended periods. When you sit on a toilet for 15 or 20 minutes scrolling your phone, the posture places sustained downward pressure on the hemorrhoidal veins. Over time this contributes to engorgement and prolapse. If the stool is not coming within five minutes of sitting down, it is better to get up, walk around, and try again later than to sit and strain. The urge to push harder and wait longer is understandable when you are already dealing with hemorrhoids, but prolonged toilet sitting makes the underlying problem worse. Setting a mental (or literal) timer and leaving the bathroom when it goes off is a surprisingly effective habit change.