Squats produce some of the highest spikes in abdominal pressure of any exercise, and that pressure does transmit downward toward the pelvic floor and anal cushions. But the relationship between squatting and hemorrhoid flare-ups is not as straightforward as “squat heavy, get hemorrhoids.” The available evidence points to breath-holding technique, existing hemorrhoid severity, and overall training habits as the factors that actually determine whether squats cause problems for you.
What Happens Inside Your Body During a Squat
When you descend into a heavy squat, pressure inside your abdominal cavity rises sharply. This intra-abdominal pressure (IAP) is partly what stabilizes your spine under load. A systematic review of pressure measurements during resistance exercises found that squats generated the highest IAP of any lift studied, exceeding 200 mmHg, compared with roughly 160 to 175 mmHg during deadlifts and leg presses and only about 79 mmHg during bench press.1PubMed Central. Systematic review of intra-abdominal and intrathoracic pressures initiated by the Valsalva manoeuvre during high-intensity resistance exercises A separate study measuring IAP across different physical activities also confirmed that squatting produced significantly higher pressure than other lifting maneuvers like picking something up from a counter.2PubMed Central. Intra-abdominal Pressure Changes Associated with Lifting: Implications for Postoperative Activity Restrictions
That pressure spike matters because the hemorrhoidal cushions sit at the lower end of your rectum, right where increased abdominal pressure gets transmitted. Think of it like squeezing a tube of toothpaste: force applied from above pushes contents downward. In someone with healthy anal cushions and connective tissue, this temporary increase comes and goes without much consequence. But in someone who already has swollen or displaced cushions, the repeated pressure surges of a heavy squat session can aggravate symptoms like bleeding, pain, or prolapse.
Why Hemorrhoids Are Vulnerable to Pressure in the First Place
Hemorrhoids are not varicose veins, as they’re sometimes described. They are normal vascular cushions that everyone has, and they only become a problem when those cushions enlarge, shift out of position, or lose the connective tissue that holds them in place.3PubMed Central. Hemorrhoids: from basic pathophysiology to clinical management The process involves both vascular changes (blood vessels widening and distorting) and structural breakdown of the surrounding tissue. When these cushions become symptomatic, they are more susceptible to pressure from any source, whether that’s straining on the toilet, pregnancy, prolonged sitting, or heavy lifting.
A key study measuring pressures directly within anal cushions found that people with hemorrhoids had dramatically higher resting pressures than people without them. Even during coughing and straining, pressures were significantly elevated. More telling: in about 60 percent of hemorrhoid patients, pressures after straining stayed elevated and took 18 to 36 seconds to return to baseline, something not seen in healthy subjects at all.4PubMed. Hypertensive anal cushions as a cause of the high anal canal pressures in patients with haemorrhoids This means that if you have existing hemorrhoids, each rep of a heavy squat isn’t just a momentary pressure spike; the tissue stays pressurized longer afterward than it would in someone without the condition.
Bodybuilding, Weightlifting, and Hemorrhoid Rates
The strongest epidemiological clue comes from a self-assessment study of athletes across multiple sports. Among those who practiced bodybuilding, 48 percent reported hemorrhoidal disease. When researchers ran a multivariate analysis accounting for age and other variables, bodybuilding practice showed a statistically significant association with hemorrhoids.5PubMed Central. Sport practice and hemorrhoidal disease: results from a self-assessment questionnaire among athletes For context, cyclists and horseback riders had an even higher self-reported rate (57 percent), but bodybuilding was one of the activities that remained significant after controlling for other factors.
This doesn’t prove squats alone are the culprit. Bodybuilders perform many heavy compound lifts, and their training sessions tend to involve repeated high-IAP efforts across multiple exercises, often with breath-holding throughout. The cumulative exposure to elevated abdominal pressure over months and years of training is likely more relevant than any single exercise. Still, the squat is the lift that generates the highest peak pressures, so it’s reasonable to flag it as a contributor for someone already at risk.
Breath-Holding Is the Bigger Problem Than the Squat Itself
Here’s where the practical nuance lives. When lifters hold their breath during a squat, they perform what’s called a Valsalva maneuver: bearing down against a closed airway. This technique is widespread in strength training because it stiffens the trunk and protects the spine. But it also magnifies intra-abdominal pressure considerably. Research shows that during resistance exercise, a Valsalva maneuver is essentially unavoidable when lifting above about 80 percent of your maximum or when pushing a lighter set to failure.6The Journal of Strength & Conditioning Research. The Valsalva Maneuver: Its Effect on Intra-abdominal Pressure and Safety Issues During Resistance Exercise
The difference between breath-holding and exhaling during a squat is substantial. One study found that IAP increased significantly when lifters held their breath compared with exhaling, regardless of whether they wore a belt.7PubMed. The effect of an abdominal belt on trunk muscle activity and intra-abdominal pressure during squat lifts The breath-hold itself was the variable driving pressure up. An interesting comparison from pelvic floor research reinforces this: when women performed a seated Valsalva/strain maneuver (essentially bearing down hard), the IAP was actually higher than during most exercises. For the majority of participants, straining at rest produced more pressure than exercising did.8PubMed Central. Intra-abdominal Pressure and Pelvic Floor Health: Should We Be Thinking About This Relationship Differently?
This has a practical implication that often gets missed: the way you breathe during squats may matter more than whether you squat at all. A person doing heavy squats with aggressive breath-holding on every rep is pushing pressure much higher than someone squatting moderate weight while exhaling through the effort. The breath-hold technique that’s standard for powerlifting and heavy strength work is exactly the technique that maximizes downward pelvic pressure.9PubMed Central. Breathing technique-dependent acute cardiopulmonary responses during squats in healthy females
Practical Modifications for People With Hemorrhoids
If you already have hemorrhoids and want to keep squatting, the evidence points toward several adjustments rather than quitting the exercise entirely. None of these are guaranteed to prevent flare-ups, but they reduce the factors most strongly linked to pressure spikes:
- Lower the load: Since pressure scales with intensity, dropping from near-maximal weights to the moderate range (roughly 60 to 70 percent of your max) reduces peak IAP meaningfully. Higher-rep sets at moderate weights let you train your legs without the same pressure extremes.
- Exhale through the sticking point: This directly contradicts standard powerlifting advice, but if hemorrhoids are your concern, exhaling during the hardest part of the rep avoids the full Valsalva effect. You’ll sacrifice some trunk stability, so the lower load matters here too.
- Avoid training to failure: The Valsalva maneuver becomes involuntary as you approach failure, even at lighter loads. Stopping a few reps short keeps the effort in a zone where controlled breathing is still possible.
- Substitute occasionally: Leg presses, lunges, and single-leg work generate lower peak IAP than barbell back squats. Rotating these in during a flare-up gives the area a break without abandoning lower-body training.
It’s also worth noting that constipation and prolonged straining on the toilet are far more established risk factors for hemorrhoid progression than any gym exercise. If you’re eating a low-fiber diet and spending ten minutes scrolling your phone on the toilet, that habit is probably doing more damage to your hemorrhoids than your squat sessions. Conservative management of early-stage hemorrhoids starts with lifestyle basics like fiber supplementation, adequate hydration, and topical treatments.10PubMed. Pharmacological treatment of hemorrhoids: a narrative review Addressing those foundations makes a larger difference than modifying your training program alone.
Heavy Lifting and Pelvic Floor Function
A common fear is that heavy squats and deadlifts will permanently weaken or damage the pelvic floor, which supports the rectal area. The research here is more reassuring than people expect. A crossover study of strength-trained women measured pelvic floor muscle function before and after heavy weightlifting sessions (including heavy squats and deadlifts). There was no significant difference in pelvic floor resting pressure, muscle strength, endurance, or resting activity after heavy lifting compared with a rest session. The researchers also found no correlation between how much a person could squat or deadlift and their pelvic floor muscle strength.11PubMed Central. Acute Effect of Heavy Weightlifting on the Pelvic Floor Muscles in Strength-Trained Women: An Experimental Crossover Study
The concern that heavy training causes chronically tight or overactive pelvic floor muscles also didn’t pan out. The same study noted that while it has been suggested strenuous training could lead to a nonrelaxing pelvic floor (which can cause pain and difficulty with bowel movements), muscle tone didn’t increase after heavy weightlifting, and evidence supporting those assumptions is currently lacking.11PubMed Central. Acute Effect of Heavy Weightlifting on the Pelvic Floor Muscles in Strength-Trained Women: An Experimental Crossover Study This is worth keeping in mind: the pelvic floor appears to handle heavy training better than the anxiety around it suggests, at least in people who are already adapted to strength training.
That said, this study was done in trained women without pelvic floor disorders. Someone with existing hemorrhoidal prolapse or pelvic floor dysfunction might respond differently. The reassurance applies most to people who are already lifting regularly and wondering whether to worry about long-term structural damage. For someone in the middle of an acute hemorrhoid flare, the temporary pressure spike still matters regardless of what happens to the pelvic floor over time.
The Gap Between Pressure Spikes and Actual Hemorrhoid Outcomes
The honest answer about the evidence is that there’s a gap between what we know about physics (squats raise abdominal pressure) and what we can prove about hemorrhoid outcomes (squats cause hemorrhoids to worsen). No randomized trial has taken people with hemorrhoids, assigned half to squat and half not to, and measured symptom progression. The bodybuilding association data is self-reported and cross-sectional, meaning it can show a link but not confirm the direction of cause and effect.5PubMed Central. Sport practice and hemorrhoidal disease: results from a self-assessment questionnaire among athletes
What the evidence does support is a plausible chain: squats generate high IAP, IAP increases downward pressure on the anal cushions, and anal cushions that are already compromised show exaggerated and prolonged pressure responses to any strain.4PubMed. Hypertensive anal cushions as a cause of the high anal canal pressures in patients with haemorrhoids The mechanism is sound, even if the direct clinical proof is thin. Most gastroenterologists and colorectal surgeons advise caution with heavy lifting during active hemorrhoid symptoms based on this reasoning, not because of randomized trials showing harm.
For someone without hemorrhoids, the concern is largely academic. The pressure generated during squats is temporary, and there’s no evidence that squatting causes hemorrhoids to develop in someone who wouldn’t have gotten them anyway. For someone with mild, early-stage hemorrhoids, modifications to load and breathing are likely enough to keep training without making things worse. For someone with prolapsing hemorrhoids (the kind that protrude during or after bowel movements), heavy squats are a reasonable thing to pause until the situation improves or is treated.
When Hemorrhoids Need Medical Attention Regardless of Exercise
If adjusting your training doesn’t help, the hemorrhoids have likely progressed beyond the point where exercise modification alone matters. Early-stage hemorrhoids (grades one and two, which bleed but don’t prolapse or prolapse but go back in on their own) can typically be managed with conservative measures like dietary fiber, topical ointments, and phlebotonics, which are oral drugs that improve vein tone.10PubMed. Pharmacological treatment of hemorrhoids: a narrative review Many people with these stages train through them without major issues once they manage the underlying symptoms.
Higher-grade hemorrhoids that stay prolapsed or can’t be pushed back in usually require a procedure. Options range from rubber band ligation for moderate cases to surgical removal for severe ones. Modern stapled procedures can get people back to daily activity in under a week on average, while traditional excision has a longer recovery but lower recurrence.12JAMA Surgery. Stapled vs Excision Hemorrhoidectomy: Long-term Results of a Prospective Randomized Trial If you’re putting off seeing a doctor because you think you just need to stop squatting, reconsider. The squat may be aggravating symptoms, but advanced hemorrhoids don’t resolve on their own regardless of what you do in the gym.
Other Exercises That Affect the Same Area
Squats get the most attention because they generate the highest peak pressures, but they’re not the only exercise worth watching. Deadlifts, heavy rows, and leg presses all produce substantial IAP, just somewhat less than squats.1PubMed Central. Systematic review of intra-abdominal and intrathoracic pressures initiated by the Valsalva manoeuvre during high-intensity resistance exercises Any exercise where you’re bracing hard against a heavy load sends pressure downward through the pelvis. Overhead presses and heavy carries also involve bracing, though typically at lower absolute loads than squats and deadlifts.
The athlete survey mentioned earlier also found that cycling and horseback riding were associated with hemorrhoidal symptoms, though through a different mechanism: sustained pressure from sitting on a narrow surface rather than intra-abdominal pressure spikes.5PubMed Central. Sport practice and hemorrhoidal disease: results from a self-assessment questionnaire among athletes If you’re cross-training with long cycling sessions on top of heavy squats, you’re hitting the hemorrhoidal cushions from two directions: repeated pressure spikes during lifting and sustained compression during riding. For someone managing hemorrhoid symptoms, that combination is worth being aware of, even if neither activity alone would be enough to cause a problem.