Heavy lifting can contribute to hemorrhoids, and the connection is more than gym folklore. The mechanism centers on intra-abdominal pressure: when you brace hard to move a heavy load, the pressure spike pushes downward on the veins around your anus and rectum in the same way that straining on the toilet does. A study of athletes found that bodybuilders were roughly three times as likely to report hemorrhoidal disease compared to other athletes, making it one of the few sports with a statistically confirmed link. That said, the relationship between lifting and hemorrhoids is not as simple as “deadlifts equal hemorrhoids,” and several factors determine whether you are actually at risk.
What Happens Inside Your Body During a Heavy Lift
Every time you lift something heavy, your torso turns into a pressurized canister. You instinctively close your glottis (the opening at the top of your windpipe), tighten your abdominal wall, and bear down. This is called the Valsalva maneuver, and it is a normal part of heavy exertion. The result is a dramatic spike in intra-abdominal pressure (IAP), which stabilizes your spine and lets you transfer force through your trunk. A systematic review of pressure measurements during resistance exercises found that squats generated the highest IAP readings, exceeding 200 mmHg, followed by deadlifts, rows, and leg presses in the range of 161 to 176 mmHg. Bench pressing, which puts less demand on the trunk, produced much lower pressures around 79 mmHg.1PubMed Central. Systematic review of intra-abdominal and intrathoracic pressures initiated by the Valsalva manoeuvre during high-intensity resistance exercises
That pressure does not stay in your midsection. It radiates downward onto the pelvic floor, the muscular hammock that supports your bladder, rectum, and the network of blood vessels around your anal canal. Hemorrhoids are essentially swollen cushions of vascular tissue in the anal canal, and they form or worsen when blood flow through those vessels gets backed up or the tissue is stretched under pressure. A single heavy squat rep might only spike the pressure for a few seconds, but over the course of a training session with multiple sets of heavy compound movements, the cumulative exposure adds up.
The IAP also increases as the weight gets heavier. Research confirms that pressure climbs in step with lifting intensity: the closer you are to your maximum effort, the higher the pressure generated inside the abdomen.2The Journal of Strength & Conditioning Research. The Valsalva Maneuver: Its Effect on Intra-abdominal Pressure and Safety Issues During Resistance Exercise This is why casual lifting around the house rarely causes problems, but grinding through heavy working sets in the gym might.
The Bodybuilding Connection
Anecdotally, lifters have always talked about hemorrhoid flare-ups. Now there is survey data to support the pattern. A study that collected self-reported questionnaire data from athletes across multiple sports found that 48% of bodybuilders reported suffering from hemorrhoidal disease. That figure was second only to cyclists and horseback riders, who came in at 57% (likely because of direct perineal pressure from their saddle rather than IAP). In a multivariable analysis that adjusted for age and other factors, bodybuilding practice was independently associated with hemorrhoidal disease, with an odds ratio of about 2.9. In plainer terms, bodybuilders had nearly three times the odds of hemorrhoid problems compared to athletes in other sports.3PubMed Central. Sport practice and hemorrhoidal disease: results from a self-assessment questionnaire among athletes
One caveat worth noting: the statistical significance held for male bodybuilders but not female bodybuilders, possibly due to the smaller number of women in the sample. That does not mean women who lift heavy are immune. It means we do not have clean enough data to draw firm conclusions about them specifically from this study.
The study also found that age itself was a modest but significant predictor, which makes sense. Connective tissue weakens over time, and the anal cushions that form hemorrhoids lose elasticity with age. A 40-year-old lifter faces a different risk profile than a 20-year-old, even if they train with the same intensity.
Why Your Pelvic Floor Cannot Always Compensate
You might assume that someone with a strong pelvic floor could simply squeeze those muscles tight enough to counteract the downward pressure during a heavy lift. The research suggests otherwise. A study that measured pelvic floor muscle activity during squats, deadlifts, leg presses, and curl-ups found that voluntarily pre-contracting the pelvic floor muscles before the lift did not generate enough force to exceed the rise in intra-abdominal pressure produced by those exercises.4PubMed Central. Can Pre-Contraction of the Pelvic Floor Muscles Exceed Increases in Intra-Abdominal Pressure During Strength Exercises? In other words, the pressure wins. Even when you actively try to brace your pelvic floor, the sheer magnitude of IAP during heavy compound lifts overwhelms it.
A separate study looking at postpartum women found that neither grip strength (a proxy for overall muscular fitness) nor pelvic floor muscle force modified the effect that intra-abdominal pressure had on pelvic floor support.5PubMed Central. Do Measures of Muscular Fitness Modify the Effect of Intra-abdominal Pressure on Pelvic Floor Support in Postpartum Women? Being stronger overall did not buffer the downward pressure on the pelvic structures. This is a humbling finding for lifters who assume their general fitness protects them. The pelvic floor is a relatively thin muscular sheet, and there is a ceiling on how much force it can generate compared to the massive pressures created by the trunk musculature during a heavy effort.
Does Lifting Cause Lasting Damage to the Pelvic Floor?
The picture gets more nuanced when you look at what happens after the session ends. A crossover study of strength-trained women measured pelvic floor muscle resting pressure, strength, endurance, and resting activity both after a heavy weightlifting session and after a rest period. No statistically significant differences were found between the two conditions. The heavy lifting session did not leave the pelvic floor weaker, more fatigued, or looser than resting quietly did.6PubMed Central. Acute Effect of Heavy Weightlifting on the Pelvic Floor Muscles in Strength-Trained Women: An Experimental Crossover Study
This suggests that the risk from lifting is primarily about what happens during the effort, not about cumulative structural damage to the pelvic floor over time. The spike in pressure is transient. Once you rack the bar, the pressure returns to baseline and the pelvic floor recovers. The problem is that hemorrhoids can develop or flare during those repeated transient spikes, especially if you train heavy multiple times per week for years. Think of it less like a single blow that breaks something and more like repeated stress on tissue that is already vulnerable.
Do Lifting Belts Make Things Better or Worse?
If your instinct is to cinch a weightlifting belt tighter to protect yourself, the physics might surprise you. Research on belt use during lifting found that wearing a belt significantly increased peak IAP compared to lifting without one.7PubMed. Effects of a belt on intra-abdominal pressure during weight lifting The belt gives your abdominal muscles something rigid to push against, which is exactly why it helps stabilize the spine and may reduce disc compression. But that same mechanism means more pressure directed downward toward the pelvic floor.
This does not mean you should ditch your belt. For spinal safety during very heavy loads, the belt likely provides a net benefit. But if you are already prone to hemorrhoid flare-ups, be aware that belted heavy squats represent something of a worst-case scenario for pelvic pressure: a heavy compound movement that already generates massive IAP, amplified further by the belt. Some lifters who deal with recurring hemorrhoids find that reserving belt use for their top sets and training sub-maximal work without one helps manage symptoms. That is an individual trade-off rather than a universal recommendation.
Other Risk Factors That Stack With Lifting
Heavy lifting rarely operates in isolation. The factors most commonly associated with hemorrhoidal disease include constipation, a low-fiber diet, high body mass index, pregnancy, and a sedentary lifestyle outside of training sessions, though a review of the literature notes that evidence for several of these is more mixed than most people assume.8PubMed Central. Lifestyle and Risk Factors in Hemorrhoidal Disease Japanese clinical guidelines describe the underlying problem as a weakening of the anal cushions combined with spasm of the internal sphincter, with bowel habits and lifestyle serving as modifying risk factors. Prevalence estimates range widely, from 4% to over 50% of the population depending on the study and how hemorrhoids are defined.9J-STAGE (Journal of the Anus, Rectum and Colon). Japanese Practice Guidelines for Anal Disorders I. Hemorrhoids
For lifters specifically, some of these risk factors are more relevant than you might think. Bodybuilders in particular often eat massive amounts of protein with relatively low fiber, which can cause constipation. They may also spend long periods sitting between training sessions while recovering. If you add chronic low-grade constipation (with straining on the toilet) on top of repeated heavy lifting sessions, you are compounding two sources of pelvic pressure. Cleaning up your diet and staying hydrated can do as much for hemorrhoid prevention as modifying your training itself.
Practical Steps for Lifters Who Get Flare-Ups
You do not have to choose between lifting heavy and living hemorrhoid-free, but some adjustments are worth considering if you experience symptoms regularly.
- Breathing technique: Avoid holding your breath for unnecessarily long periods during a rep. A controlled Valsalva through the sticking point, followed by exhaling through the top of the lift, limits how long peak pressure is sustained. Holding your breath for entire sets of high-rep work is a different level of exposure than a brief brace during a heavy single.
- Exercise selection: Squats and deadlifts produce the highest intra-abdominal pressures. If you are in the middle of a flare-up, temporarily substituting machine-based leg work or lighter variations can reduce symptoms while you recover.
- Load management: Since IAP scales with effort, training at a moderate intensity (leaving a few reps in reserve) generates meaningfully less pressure than grinding out maximal attempts. Periodizing your training so that truly heavy phases alternate with lighter phases gives your body recovery windows.
- Fiber and hydration: Soft, easy-to-pass stools reduce straining on the toilet, which is the other major source of hemorrhoid-aggravating pressure. Enough fiber and water to keep things moving smoothly is a simple intervention that many lifters overlook.
None of these steps will guarantee that you never develop hemorrhoids, but they shift the odds meaningfully. The goal is to reduce cumulative exposure to high pelvic pressure across all parts of your day, not just the gym.
Connective Tissue Vulnerability and Individual Differences
Some people seem to tolerate decades of heavy lifting without a single hemorrhoid flare-up, while others develop symptoms early in their training career. Part of this comes down to the connective tissue you were born with. People with connective tissue disorders such as Ehlers-Danlos syndrome (the hypermobility type) may be especially susceptible. A case report highlighted the association between this condition and hemorrhoidal disease, noting that the weakened connective tissue characteristic of the syndrome could predispose the anal cushion tissue to prolapse and swelling.10PubMed Central. Ehlers-danlos syndrome-hypermobility type and hemorrhoids
You do not need to have a diagnosed connective tissue disorder for this to be relevant. Connective tissue quality exists on a spectrum. If you are hypermobile, bruise easily, or have family members who developed hemorrhoids or varicose veins at a young age, your tissue may be inherently less resilient to the kind of repeated pressure that heavy lifting delivers. This is not a reason to stop training, but it is a reason to pay closer attention to the risk-reduction strategies described above, and to treat early symptoms seriously rather than pushing through them.
Occupational Lifting Versus Recreational Lifting
The question of whether lifting causes hemorrhoids is not limited to the gym. Manual laborers, warehouse workers, movers, and anyone whose job involves frequent heavy lifting face the same basic physics. The difference is that recreational lifters typically choose their load, control their rest periods, and train a few hours per week. Occupational lifters may spend entire shifts handling heavy objects with poor body mechanics, less control over pacing, and no structured recovery.
Research has not clearly separated the hemorrhoid risk of occupational lifting from recreational lifting, partly because studies on hemorrhoid risk factors tend to lump all heavy lifting into one category. What we can say is that the dose matters. A warehouse worker lifting moderate loads hundreds of times per shift might accumulate more total pelvic pressure exposure than a powerlifter who does 25 heavy reps in a training session. The sustained, repetitive nature of occupational lifting, often combined with time pressure that encourages holding the breath, makes it a plausible contributor. If you work a physically demanding job and also train heavy in the gym, you are getting a double dose of intra-abdominal pressure that is worth being aware of.
When Hemorrhoids During Training Need Medical Attention
Most hemorrhoid flare-ups related to lifting are mild: some discomfort, minor bleeding, maybe a small external lump that resolves within a week or two with basic care. Over-the-counter topical treatments, sitz baths, and temporarily dialing back training intensity are usually enough. But there are situations where you should see a doctor rather than just waiting it out.
Persistent bleeding that does not resolve after a couple of weeks, hemorrhoids that prolapse (bulge out) and cannot be pushed back in, significant pain that interferes with sitting or daily activities, or any thrombosed hemorrhoid (a hard, painful, bluish lump caused by a blood clot) all warrant medical evaluation. Colorectal specialists have a range of treatments from rubber band ligation to surgical options for cases that do not respond to conservative measures. Rectal bleeding in particular deserves attention because it can occasionally signal something other than hemorrhoids, and a doctor can rule out other causes.
Many lifters are reluctant to bring up hemorrhoid symptoms with a doctor, treating it as an embarrassing occupational hazard. Colorectal specialists see hemorrhoid patients constantly and will not be surprised to hear that your deadlift PR came with a side effect. Getting evaluated early, when a flare-up is still minor, gives you the most treatment options and the fastest return to normal training.