Incontinence When Running: Why It Happens and How to Stop It

Running-related urinary incontinence is a form of stress urinary incontinence caused by the repeated impact forces of each stride driving up pressure inside the abdomen faster than the pelvic floor muscles can counter it. It is far more common than most runners realize: a systematic review and meta-analysis of female athletes across sports found an overall prevalence of about 26%, with stress urinary incontinence specifically affecting roughly one in five.¹ The condition affects young athletes who have never been pregnant, postpartum runners returning to training, and even men, though at lower rates. And while it is rarely dangerous, it can quietly push people away from a sport they love.

What Actually Happens Inside Your Body

Every time your foot hits the ground during a run, a pulse of force travels up through your skeleton and briefly spikes the pressure inside your abdomen. Continence depends on the pelvic floor muscles reacting fast enough to squeeze around the urethra before that pressure spike can push urine past the closure mechanism.² When the pelvic floor cannot generate enough counter-pressure in time, leakage results. Researchers have tried to pin down exactly how much of the problem is driven by the bounce and jolt of running itself. One study that measured intra-abdominal pressure with an intravaginal sensor during running found a positive link between pelvic acceleration and peak abdominal pressure, but that relationship explained only about 12 to 19% of the variation between runners.³ In other words, impact force matters, but it is far from the whole story. Individual differences in pelvic floor strength, tissue stiffness, and neuromuscular timing play large roles too.

An interesting finding complicates the intuitive “your muscles get tired during the run” explanation. When researchers used intravaginal dynamometry to measure pelvic floor strength before and after a run in both continent and incontinent runners, they found no acute decline in muscle function in either group.⁴ The leaking that happens during a run does not appear to be caused by the pelvic floor fatiguing over the course of that particular session. Instead, the issue seems to be a baseline gap between the pressure demands of running and a given person’s pelvic floor capacity, one that exists before the run even starts.

Who Is at Risk (And It Is Not Just New Moms)

Childbirth is the most widely recognized risk factor, and the data backs that up. Among postpartum runners, vaginal-assisted delivery roughly doubled the odds of stress urinary incontinence, while a birth spacing of less than two years also raised the odds substantially.⁵ Caesarean delivery, by contrast, lowered the odds in multiple studies.⁶ Having experienced running-related leakage before or during pregnancy was one of the strongest predictors of having it afterward, with odds roughly four times higher.

But pregnancy is not required. Research on young, nulliparous female athletes — women who have never given birth — shows that running and other high-impact activities provoke incontinence at surprisingly high rates.⁷ A classic study of elite nulliparous athletes found that about 28% reported urine loss during sport, with jumping, high-impact landings, and running being the most common triggers.⁸ The researchers described this as evidence for a “continence threshold” that even a young, fit body can exceed when impact forces are high enough. Among elite female endurance athletes specifically, close to 46% reported leakage associated with coughing or sneezing, a hallmark of stress incontinence.⁹

A study of Brazilian female road runners found that BMI, the birth weight of the largest baby, and episiotomy were all associated with stress urinary incontinence, pointing to the role of tissue stretch and recovery.¹⁰ Relative energy deficiency in sport (known as RED-S), a condition where caloric intake falls short of what training demands, has also been linked to pelvic floor dysfunction, suggesting that under-fueling may weaken the tissues that keep you dry.¹¹

Men Get It Too

Running-related incontinence is overwhelmingly discussed as a women’s issue, but it is not exclusive to women. A cross-sectional study of elite track and field athletes found that about 19% of male athletes reported urinary incontinence, significantly lower than the rate in female athletes but hardly negligible.¹² Among the male athletes with incontinence, about 38% said it happened during sport training, with running tasks accounting for the largest share. The profile looked different from the women’s: urgency incontinence (the sudden strong need to go) was more common than stress incontinence in men, and the vast majority rated their symptoms as slight. Still, it is worth knowing that a male runner experiencing leakage is not alone and is not experiencing something medically bizarre.

How Running Technique Can Help

If impact forces drive abdominal pressure spikes, then reducing those forces during running should logically help. Early research supports this. A six-week cadence retraining program for postpartum runners with stress urinary incontinence found that increasing step rate and decreasing vertical oscillation (the amount you bounce up and down with each stride) led to statistically significant improvements in incontinence symptoms.¹³ A separate case study found that retraining a runner’s gait to reduce the sound intensity at foot strike — essentially learning to land more quietly — also improved incontinence symptoms.¹⁴

Research has also explored how foot strike pattern affects pelvic floor muscle activity. One study had women run on a treadmill using both a rearfoot strike and a forefoot strike, measuring pelvic floor electromyography. Vertical loading rate and pelvic floor activity both increased with speed, supporting the general idea that the pelvic floor has to work harder as impact gets heavier.¹⁵ The practical takeaway from these studies is that you do not have to overhaul your entire running form. Small adjustments that reduce bouncing and heavy landing, like taking slightly shorter, quicker steps, may meaningfully reduce leakage.

Pelvic Floor Muscle Training

This is the intervention with the most evidence behind it, and it works for athletes, not just sedentary patients. A systematic review and meta-analysis focused specifically on female athletes found that pelvic floor muscle training produced a significant increase in maximal voluntary contraction strength and a significant reduction in urine leakage.¹⁶ Another systematic review of women in high-impact sports confirmed that training improved both the frequency and amount of leakage.¹⁷

That said, the evidence, while positive, comes with caveats. A critically appraised topic review noted that study quality across the research remains limited and that how well training works may depend on the specific demands of the sport.¹⁸ Running places different stresses on the pelvic floor than, say, weightlifting or gymnastics, and there are not yet standardized training protocols designed specifically for runners. What the evidence does clearly support is that doing the training is substantially better than doing nothing, even if the “ideal” program is still being worked out.

One common mistake is thinking of pelvic floor training as simply squeezing and releasing (“Kegels”) while sitting at your desk. For runners, the muscles need to react quickly under load, so training that includes fast-twitch contractions and exercises done in weight-bearing positions tends to be more relevant than slow holds done lying down. Working with a pelvic health physiotherapist, at least initially, helps ensure you are actually engaging the right muscles. Many people unknowingly bear down instead of lifting, which can make things worse.

Breathing Patterns and Pressure Management

How you breathe during exertion has a direct relationship with how much pressure your pelvic floor has to withstand. The pelvic floor muscles naturally contract during exhalation and relax during inhalation as part of their coordination with the diaphragm and abdominal muscles.¹⁹ Holding your breath during effort, particularly in an inhalation pattern, drives up intra-abdominal pressure while the pelvic floor is in its relaxed state. That combination is the worst-case scenario for continence. While runners do not consciously hold their breath the way a weightlifter might, some runners do adopt bracing habits, especially during hills or speed work, that mimic this pattern. Paying attention to exhaling through the moment of greatest effort, rather than clamping down and holding air in, can reduce the pressure load on the pelvic floor.

Devices and Products That Reduce Leakage

For runners who want immediate relief while working on longer-term solutions, several intravaginal devices and external products exist. Pessaries, which are firm rings or discs inserted vaginally to support the bladder neck, and even ordinary tampons have been studied. A systematic review found that both pessaries and tampons reduced leakage during exercise, with two studies suggesting tampons may actually outperform pessaries in high-impact settings.²⁰ Vaginal sponges also showed benefit. Researchers have noted, however, that high-quality evidence for these devices remains limited, and purpose-designed intravaginal devices for running-induced incontinence are currently being studied in clinical trials.²¹

On the external side, supportive compression underwear has shown surprisingly good results. A randomized controlled trial compared wearing firm supportive underwear (essentially a compression shaper) to pelvic floor muscle training over 12 weeks. Both groups saw dramatically better outcomes than the no-treatment group: about 73% of the underwear group and 74% of the training group experienced at least a 50% reduction in weekly leakage episodes, compared to 25% in the control group.²² The mechanism is likely external compression helping to support the pelvic structures passively. For runners who want a no-fuss option while building pelvic floor strength, compression shorts or supportive underwear are worth trying.

Caffeine and Fluid Intake

Many runners drink coffee before a run, and the caffeine question comes up frequently. A large study of US women found that caffeine intake in the highest quartile (roughly 200 mg or more per day, equivalent to about two cups of coffee) was associated with a nearly 50% higher odds of any urinary incontinence compared to the lowest intake level.²³ That association was for incontinence in general, not specifically running-related leakage, and the link with moderate-to-severe incontinence was weaker. Still, caffeine is a bladder stimulant, and cutting back before a run, or at least not loading up on coffee right beforehand, is a low-cost experiment for anyone dealing with leakage.

Fluid restriction is a trickier issue. Some runners deliberately limit water intake before and during runs to manage leakage. Qualitative research has found that women with pelvic floor symptoms adopt “meticulous and restrictive coping strategies,” including limiting fluid intake, to control symptoms during exercise.²⁴ This is understandable but risky, especially during long or hot runs. Dehydration carries its own performance and health costs. A better strategy is to empty your bladder as completely as possible before heading out, and to time fluid intake so you are not running with a full bladder.

The Emotional Side

Running-related incontinence causes embarrassment and isolation that rarely gets discussed. The same qualitative study found that women experienced judgment from others, anger, fear of their symptoms becoming known, and withdrawal from team or group exercise settings.²⁴ Women reported restricting not just fluids but their clothing choices, the type of exercise they did, and how hard they trained, all to avoid a visible episode. Some dropped out of running entirely. This avoidance pattern is a real loss, both for fitness and for the mental health benefits that running provides.

The reluctance to seek help is part of the problem. Research on high-impact sport athletes found that while urinary incontinence was common, its measured impact on quality of life was described as “slight.”²⁵ That might mean many cases are mild in volume, but it may also reflect normalization. When leaking during sport is treated as just something that happens, athletes are less likely to mention it to a clinician. If you are modifying your runs, avoiding races, or wearing dark clothes “just in case,” the impact is not slight, and treatment options exist.

The Menstrual Cycle and Hormones

A common belief among runners is that leakage gets worse at certain points in the menstrual cycle, which would make intuitive sense given that estrogen and progesterone affect connective tissue and muscle function. But when researchers measured pelvic floor muscle strength across different cycle phases, they found no significant differences. Baseline strength, contraction strength, and overall pelvic floor strength were essentially the same regardless of where a woman was in her cycle.²⁶ That does not rule out the possibility that cycle-related changes in fluid retention, bloating, or bowel habits might indirectly influence incontinence symptoms, but the pelvic floor muscles themselves do not appear to weaken at any particular phase.

When Conservative Measures Are Not Enough

For elite athletes with severe symptoms that do not respond to pelvic floor training, gait changes, and devices, surgical options exist. A study using cluster analysis of treatment strategies in elite female athletes with severe stress urinary incontinence found that younger participants in particular benefited from interventions such as midurethral sling surgery and laser treatment for significant improvement.²⁷ Surgery is not the first-line approach for recreational runners, and the vast majority of people will improve substantially with conservative measures. But if you have done several months of supervised pelvic floor training, adjusted your running mechanics, tried supportive devices, and still cannot run without significant leakage, a referral to a urogynecologist or urologist is a reasonable step.

Gastrointestinal Symptoms on the Run

Runners dealing with urinary incontinence sometimes also experience bowel symptoms, particularly diarrhea and, in rarer cases, fecal incontinence. The pelvic floor is responsible for both urinary and bowel continence, so the same muscle weakness or coordination issues can affect both systems. A case report documented endurance athletes who developed diarrhea and fecal incontinence during strenuous exercise, though in those particular cases the symptoms turned out to be related to underlying spinal and gastrointestinal conditions rather than simple pelvic floor dysfunction.²⁸ The broader point is that if you are experiencing any form of incontinence during running, bowel or bladder, it is worth getting a full evaluation rather than just chalking it up to the jostling of exercise. Most of the time the explanation is straightforward pelvic floor insufficiency, but occasionally something else is going on.