Leaking urine when running: why it happens and what helps

Leaking when you run is usually stress incontinence: each footstrike sends a jolt of pressure down onto the bladder, and the pelvic floor muscles that should close the outlet don't hold against it, often because they are weak, tired, or too tight to react. It is common, it is not something you have to accept, and for most women it improves with pelvic floor training that is built up to impact, a few changes on run days and, where needed, help from a pelvic floor physical therapist.

This guide explains why running in particular sets off leaks, how to tell which kind you have, a run-day routine, a set of tests that show whether your pelvic floor is ready for impact, a 12-week way back to running without leaks, and the signs that mean you should see a doctor first. The same steps apply to leaks during other exercise: skipping, jumping, aerobics, tennis or HIIT classes.

Why do I leak when I run?

Running is a long series of small landings. Studies of running mechanics measure the force through the leg on each landing at around two to three times body weight, and a run of half an hour is a few thousand of those landings. Each one pushes your organs down a little and raises the pressure in your belly. For the bladder to stay closed, the pelvic floor has to tighten at the right moment and lift back up, every stride, for the whole run.

A leak happens when the pressure wins. The common reasons:

• Weak muscles. The pelvic floor can't close the urethra hard enough against the jolt. Pregnancy, birth, years of straining and the drop in estrogen around menopause all play a part.
• Tired muscles. Many women run dry for the first few kilometres and leak near the end. The pelvic floor has stamina like any muscle: it can hold for 20 minutes and not for 50.
• Too-tight muscles. A pelvic floor that is clenched all the time has nowhere left to go. It can't tighten further when the landing comes, and it tires early. Women who hold their belly in while running often have this.
• Extra pressure from above. Constipation, a full bowel, a heavy cough, extra body weight or breath-holding all add load the pelvic floor has to resist.
• Weaker support tissue. The ligaments and connective tissue that hold the bladder and urethra in place carry part of the load too. Researchers in Ottawa who studied female runners found the passive support around the bladder mattered, not just muscle strength.

How common is it?

Very. A 2018 review that pooled studies of female athletes found that about 36% had urinary leaks, and a 2020 review of high-impact sports, including running, put it at about 26%. These were mostly young, fit women. After 40, with births behind you and estrogen falling, the odds go up, not down. Many women never mention it to a doctor and simply stop running, cut their runs short, or plan routes around toilets. You don't need to: leaks during exercise are one of the most treatable kinds.

Stress leaks or urge leaks on a run?

Most running leaks are stress leaks, but not all. The type changes what helps.

Plenty of women have both, called mixed incontinence. If the sudden rush is your main problem, read sudden urge to pee and can't hold it first. If you also leak when you sneeze, cough or laugh, our guide to leaking urine when you sneeze or cough covers the quick squeeze that helps there.

Is my pelvic floor too weak, or too tight?

This matters, because the fix is the opposite. A weak floor needs strength. A tight floor needs to learn to let go before strength work helps. Signs that tightness may be part of your picture:

• Pain with sex, tampons or a pelvic exam.
• Trouble starting to wee, a slow or stop-start stream, or a feeling you haven't emptied.
• Constipation or straining.
• Aching in the hips, low back, tailbone or groin after runs.
• You notice you hold your belly and bottom tight most of the day.

If several fit, read tight pelvic floor symptoms and start with how to relax your pelvic floor muscles before you add more squeezing. A pelvic floor physical therapist can tell you for certain with a short internal exam.

What to do on run days

These won't fix the cause on their own, but they cut the number of leaks while your training catches up.

Before you run

• Empty your bladder shortly before you leave, once. Don't go again "just in case" two or three times: that trains the bladder to signal earlier.
• Empty your bowel if you can. A full rectum presses on the bladder and the pelvic floor.
• Don't stop drinking. Cutting water makes urine concentrated, which can irritate the bladder and make urges worse. Sip steadily through the day instead of drinking a big glass right before the run.
• Skip the coffee right before. Caffeine makes the bladder fill faster and can make it more twitchy. If you want it, have it earlier, and see whether your leaks change.
• Do a short pelvic floor warm-up. Five slow lifts with a full let-go between, then five quick ones. It reminds the muscles to switch on.

During the run

• Breathe; don't brace. Holding your breath or sucking your belly in pushes pressure down. Let the belly move a little as you breathe.
• Try shorter, quicker steps. Many running coaches and physios suggest a slightly higher step rate with a shorter stride, which tends to soften each landing. There's no trial on leaks yet, so treat it as worth a try, not a cure.
• Choose softer, flatter routes at first: grass, trails, a track. Long, steep downhills and stairs are the hardest on the pelvic floor.
• Run within your stamina. If you always leak after 25 minutes, run 20, or run 20 and walk 5. The aim is to finish dry and build the time up, not to push through.
• Squeeze before a known spike: a kerb jump, a sprint finish, a cough. A quick, firm lift just before is the same trick that helps with sneezes.

After the run

• Let the pelvic floor fully relax: a few slow belly breaths lying down, feeling the floor drop and soften. Tired muscles that stay clenched are more likely to ache and leak next time.
• Note in your phone how long you ran before any leak, and how much. That number is how you'll see progress.

Exercises that help running leaks

The first treatment guidelines recommend for stress leaks is supervised pelvic floor muscle training for at least 3 months. The UK's NICE guideline asks for at least 8 squeezes three times a day. A Cochrane review of the trials found that women who did this training were much more likely to report being cured or improved than those who didn't. For running, the training needs three parts, in order:

1. A correct squeeze. A lift up and in, not a push down. Up to half of women get this wrong at first. Check yours with our guide to how to do Kegels correctly.
2. Strength and stamina. Slow holds of up to 10 seconds, 10 in a row, with a full let-go between, plus 10 quick, strong lifts. Lying down first, then sitting, then standing.
3. Training for impact. Squeezing while you move: during squats, step-ups, lunges, then small hops. Running asks the floor to react in a fraction of a second, so it has to practise being quick, upright and on the move.

The rest of your body matters too. Strong hips and glutes help control each landing, and calf strength absorbs some of the force before it reaches the pelvis. The tests below include them for that reason.

For a full 10-minute session laid out step by step, see our pelvic floor exercise routine for women. If you're over 50 or have stiff knees or back, pelvic floor exercises for women over 50 has positions that work around them.

Are you ready for impact? Seven tests

In 2019, three UK physiotherapists (Tom Goom, Grainne Donnelly and Emma Brockwell) published guidance on returning to running after giving birth. Its load and impact tests are now widely used by physios as a check for any woman whose pelvic floor struggles with running. Try them at home. Each one should be done without leaking, heaviness or dragging in the vagina, or pain:

The same guidance suggests strength checks too: 20 single-leg calf raises, 20 single-leg bridges, 20 single-leg sit-to-stands from a chair, and 20 side-lying leg lifts, each side. If you can't pass a test yet, that test becomes your exercise. Practise it with a pelvic floor squeeze, a few times a week, and test again in two weeks.

If you have given birth in the last year, the guidance advises no running before 12 weeks after birth, and a check with a pelvic health physio first.

A 12-week way back to running without leaks

This is a sample plan for a woman who leaks on most runs and passes the walking and balance tests. Move to the next stage when you've had a dry week. If leaks come back, drop back one stage for a week; that's normal, not failure.

Most of the trials judged pelvic floor training at about three months, and changes often start to show in 6 to 8 weeks. For what to expect week by week, see how long Kegels take to work.

Leaks when jumping, skipping or at the gym

Jumping, skipping, trampolines and jump squats put more force through the pelvic floor than running, and they come in quick bursts with no time to brace. That is why many women who can jog dry still leak on a trampoline. Treat them as the next step after running: once you can run for 30 minutes dry, add 10 jumps with a squeeze, then 20, then a minute of skipping. Heavy lifting is different again. The leak comes from holding your breath and bearing down. Breathe out as you lift, and squeeze just before the effort. If you leak with heavy weights, drop the weight a little while you learn the timing.

Menopause and running leaks

Many women who ran for years without trouble start leaking in their late 40s or 50s. Falling estrogen thins the tissue of the urethra and the vagina and can weaken the seal, and muscle mass falls with age unless it's trained. Training still works after menopause. For some women, a doctor may also suggest vaginal estrogen, which treats the tissue rather than the muscle. Read more in bladder leakage and menopause.

Pads, period pants and support devices

Pads, leak-proof underwear and dark running shorts are fine for confidence while you train. They don't treat anything, so keep doing the exercises. Some women also use a support device placed in the vagina during exercise, either a continence pessary fitted by a clinician or a disposable over-the-counter one. NICE says these devices aren't a routine treatment but can be considered for occasional use, such as during exercise. A pessary also helps some women with a mild prolapse who want to keep running. Ask your doctor or physio whether one suits you.

What doctors and physios can offer

• A pelvic floor physical therapist can check your squeeze with an internal exam, tell weak from tight, and set exercises at the right level. Some use biofeedback, a sensor that shows your squeeze on a screen.
• A doctor can rule out infection, check for prolapse, and talk about vaginal estrogen after menopause.
• If training isn't enough after a fair trial, there are procedures for stress incontinence, from bulking injections to sling surgery. Each has its own risks and benefits, and guidelines put them after a full course of training.

When to see a doctor before you train

Get checked rather than training on your own if you have:

• A bulge, heaviness or dragging feeling in the vagina, especially after running or at the end of the day. This can be a prolapse, and high impact can make it worse.
• Blood in your urine, burning, a fever, or pain low in your belly or side.
• Leaks that started suddenly with no clear reason, or that happen at rest.
• Leaking from the bowel, or trouble emptying your bladder or bowel.
• Numbness around your bottom or genitals, new trouble peeing, or weak legs, with back pain. This needs urgent care the same day.

Frequently asked questions

Is it normal to leak urine when running?

It's common, but not something you have to live with. About a third of female athletes report leaks. Most can cut them down or stop them with pelvic floor training built up to impact.

Should I stop running if I leak?

Not necessarily. If you have no heaviness, bulge or pain, you can usually keep running at a level where you stay dry, or mostly dry, while you train. Run shorter, walk–jog, and build up. If you have signs of prolapse, see a doctor or physio before running again.

Why do I only leak at the end of a long run?

Usually fatigue. The pelvic floor can hold for a while, then tires. Train stamina with longer holds and more of them, and build your run time slowly so the muscles keep up.

Will drinking less stop the leaks?

It may cut the amount, but concentrated urine can irritate the bladder and make urges worse, and dehydration hurts your run. Drink steadily through the day, and skip large drinks in the hour before.

Do running shoes make a difference?

There's no good trial showing shoes change leaks. Well-fitting, cushioned shoes and softer surfaces may make landings feel gentler. They're worth getting right, but they don't replace training.

Can I train my pelvic floor while running?

Not by squeezing every step: that tires the muscles and you'd run stiffly. Train it off the run with holds, quick lifts and moving drills, and use a single squeeze before a known jolt like a kerb jump.

Start with your next run

On your next run, note the minute you first leak. Then try the seven tests at home and see which ones you fail; those are your first exercises. To see in one minute why Kegels from a leaflet often don't help, and what a daily plan built up week by week looks like, take the free 1-minute check. For more on leaks, urges and the pelvic floor after 40, see all our pelvic floor guides.

Sources: NICE guideline NG123, Urinary incontinence and pelvic organ prolapse in women: management, 2019. Dumoulin C. et al., Pelvic floor muscle training versus no treatment, or inactive control treatments, for urinary incontinence in women, Cochrane Database of Systematic Reviews, 2018. Teixeira R.V. et al., Prevalence of urinary incontinence in female athletes: a systematic review with meta-analysis, International Urogynecology Journal, 2018. Pires T. et al., Prevalence of urinary incontinence in high-impact sport athletes: a systematic review and meta-analysis, Journal of Human Kinetics, 2020. Goom T., Donnelly G., Brockwell E., Returning to running postnatal: guidelines for medical, health and fitness professionals, 2019. Cavanagh P.R., Lafortune M.A., Ground reaction forces in distance running, Journal of Biomechanics, 1980. NIDDK, Bladder control problems in women. NHS, Cauda equina syndrome. This guide is education, not medical advice.