This is Part 1 in our series on common running issues that don’t get enough attention, the uncomfortable stuff runners deal with but rarely discuss. These aren’t injuries that’ll sideline you for months, but they’re annoying enough to ruin runs and make you question what you’re doing wrong. Read Part 2: Why You Get a Stitch When Running
If you’ve ever finished a 20-kilometer run feeling great, only to wake up the next morning with that familiar burning sensation, you’re not alone. I’ve heard this from enough clients that I started asking about UTIs during training check-ins just to get ahead of it.
Long runs create the perfect conditions for urinary tract infections. Dehydration, holding your pee, sweaty tight clothes, hours of bladder jostling. Some of these are easy fixes. Others require planning ahead.
What’s Actually Happening
A urinary tract infection happens when bacteria (usually E. coli from your bowel) get into your urethra and multiply in your bladder. Women are more prone to UTIs than men because we have a shorter urethra, which means less distance for bacteria to travel.
Running doesn’t directly cause UTIs, but it creates conditions that make them more likely. Long runs hit multiple risk factors:
Dehydration. When you’re dehydrated, your body produces less urine. Less urine means bacteria aren’t getting flushed out the way they should be. Concentrated urine also irritates your bladder lining.
Holding it in. If you’re training for a marathon and running for two or three hours at a time, you’re probably holding your pee. Bacteria multiply in your bladder when urine sits there too long.
Tight, sweaty clothes. Running shorts, leggings, and underwear trap heat and moisture around your urethra. Bacteria love warm, moist environments.
Repetitive friction. If your running clothes are rubbing against your urethra for hours, that can cause tiny abrasions or irritation. Irritated tissue is more vulnerable to infection.
Weakened immune system. If you’re overtraining or not recovering properly, your immune system can’t fight off infections as well.
The Pattern I See With Clients
It doesn’t happen to everyone, but when it does happen, there’s usually a pattern. It is also more common in women compared to men due to anatomical differences. The women I’ve worked with who get UTIs from running tend to fall into one of two categories.
First type: Training hard for a long race (half marathon, marathon, ultra). Running volume goes up, hydration doesn’t keep pace. They’re pushing through 25- or 30-kilometer training runs and ignoring the need to pee because there’s no bathroom. By the time they get home, the damage is done.
Second type: Started running more seriously in their mid-30s or early 40s. Never had UTI problems before, now they’re getting them every few months. This group is often perimenopausal or postmenopausal, which changes vaginal pH and makes infections more likely.
I had one client who was training for her first marathon and kept getting UTIs during her peak training weeks. She was carrying water but only taking small sips because she didn’t want to deal with finding a bathroom mid-run. Once we planned her routes to pass bathrooms and she actually drank enough to stay hydrated, the UTIs stopped.
Another client in her early 40s was getting UTIs every few weeks. Turned out she was wearing synthetic leggings that didn’t breathe well and trapped moisture. Once she switched to more breathable fabrics and changed out of sweaty clothes immediately after runs, the infections stopped. Her doctor also addressed perimenopausal hormone changes that were making her more susceptible.
What Actually Helps
Drink more water. This one is boring but it works. You need to produce enough urine to flush out bacteria. A study found that women prone to UTIs cut their infection rate in half by drinking six extra cups of water per day. On long runs (90 minutes or longer), carry water and drink it. Not just sips. Actual hydration. Plan your route near water fountains if you don’t want to carry a bottle. Stop and use the bathroom if you need to.
Pee before and after your run. Don’t hold it. If you’re doing a long run and there’s no bathroom on your route, plan better. Run loops that pass your house or a coffee shop. Find a trail with a porta-potty. Women who run ultras deal with this constantly.
Change out of your running clothes immediately. Shower as soon as you get home. Don’t sit around in sweaty clothes for an hour. Bacteria multiply fast in that environment.
Wear breathable fabrics. Some synthetic materials trap moisture more than others. If you’re getting frequent UTIs, try different fabric blends or switch to more breathable options. Cotton underwear works better than synthetic for some women. If you prefer performance fabrics, make sure you’re washing them after every run.
Consider running without underwear. Some runners swear by going commando to reduce friction and moisture. Worth trying if you keep getting infections.
Use a barrier cream. A thin layer of Vaseline or Sudocrem over your urethral opening before a run can reduce friction. This sounds weird but it helps.
Don’t overtrain. If you’re constantly tired, getting sick more often, or noticing other signs of overtraining, your immune system is struggling. Back off your volume and prioritize recovery.
Additional Prevention Strategies
Consider cranberry supplements. A 2023 Cochrane review of 50 studies found cranberry products reduced UTI risk by about 30% overall, and specifically by 26% in women with recurrent UTIs. Cranberry capsules or powder (500mg daily) work better than juice because they have higher concentrations of proanthocyanidins (the active compound) without all the sugar. If you get recurrent UTIs, cranberry supplements are worth trying alongside hydration and hygiene measures.
If You Already Have a UTI
Can you run with a UTI? Technically yes. Should you? Probably not.
Running while you have an active infection won’t make the infection spread or cause kidney damage, but it can make you feel worse. Dehydration during a run can prolong the infection. High-impact running puts pressure on your bladder, which is already inflamed.
If you decide to run anyway, keep it short, stay close to bathrooms, and drink a lot of water. Most people with UTIs don’t feel like running anyway because the symptoms are miserable.
See a doctor and get antibiotics. Don’t try to push through it. One warning: if your doctor prescribes a fluoroquinolone antibiotic (ciprofloxacin, levofloxacin, or anything ending in -oxacin), ask about other options. The FDA issued warnings about these antibiotics due to serious side effects including tendon ruptures, which can happen weeks after you finish taking them. The FDA recommends against using them for uncomplicated UTIs. Most runners can’t afford to risk a spontaneous Achilles rupture.
When to See a Specialist
If you’re getting UTIs more than twice in six months or three times in a year, see a urologist or urogynecologist. Recurrent infections usually mean something else is going on: pelvic floor dysfunction, hormonal changes (perimenopause or menopause), anatomical issues (some women have a urethra positioned closer to the vaginal opening), chronic dehydration, or overtraining wearing down your immune system.
A specialist can test for these and recommend treatments. Pelvic floor physical therapy has been shown in studies to be effective for recurrent UTIs by helping you fully empty your bladder and addressing tight pelvic floor muscles that can trap bacteria. For perimenopausal and postmenopausal women, vaginal estrogen therapy can reduce UTI frequency significantly by restoring vaginal pH and tissue health.
The Bottom Line
Long runs put you at higher risk for UTIs because of dehydration, friction, and holding your pee for hours. Most of this is fixable with better hydration, smarter clothing choices, and route planning that includes bathroom access.
If you’re getting UTIs regularly, see a doctor. Don’t just keep treating them with antibiotics and hoping it stops. There’s usually something else going on.
For women training for distance events in Toronto, this is one of the health issues I talk through with clients during program design. Hydration strategy, recovery, and injury prevention all matter if you want to train consistently without getting sidelined by infections or other problems. If you’re dealing with recurrent UTIs and need help structuring your training to reduce risk, book a discovery call.
FAQs
Technically yes, but you probably shouldn’t. Running won’t make the infection spread, but it can make you feel worse and may prolong the infection through dehydration. See a doctor and get antibiotics first.
Most likely you’re either dehydrated, holding your pee for too long, or both. Plan your routes to include bathroom stops and drink enough water during the run.
Yes, they help. A 2023 review of 50 studies found cranberry products reduced UTI risk by about 30% in women with recurrent infections. Take 500mg daily of cranberry powder or capsules, not juice.
Breathable fabrics that don’t trap moisture. If you’re getting frequent UTIs, try different materials and change out of sweaty clothes immediately after your run.
Yes. If you’re getting UTIs more than twice in six months or three times in a year, see a urologist or urogynecologist. Recurrent infections usually mean there’s an underlying issue that needs treatment.
Yes, though it’s less common because men have a longer urethra. The same prevention strategies apply: stay hydrated, don’t hold your pee, and change out of sweaty clothes.
FAQs
Technically yes, but you probably shouldn’t. Running won’t make the infection spread, but it can make you feel worse and may prolong the infection through dehydration. See a doctor and get antibiotics first.
Most likely you’re either dehydrated, holding your pee for too long, or both. Plan your routes to include bathroom stops and drink enough water during the run.
Yes, they help. A 2023 review of 50 studies found cranberry products reduced UTI risk by about 30% in women with recurrent infections. Take 500mg daily of cranberry powder or capsules, not juice.
Breathable fabrics that don’t trap moisture. If you’re getting frequent UTIs, try different materials and change out of sweaty clothes immediately after your run.
Yes. If you’re getting UTIs more than twice in six months or three times in a year, see a urologist or urogynecologist. Recurrent infections usually mean there’s an underlying issue that needs treatment.
Yes, though it’s less common because men have a longer urethra. The same prevention strategies apply: stay hydrated, don’t hold your pee, and change out of sweaty clothes.
References
Hydration and UTI Prevention: Hooton TM, et al. Effect of Increased Daily Water Intake in Premenopausal Women With Recurrent Urinary Tract Infections. JAMA Internal Medicine. 2018.
Fluoroquinolone Antibiotics and Tendon Rupture: U.S. Food and Drug Administration. FDA Drug Safety Communication: FDA updates warnings for fluoroquinolone antibiotics on risks of mental health and low blood sugar adverse reactions. 2018.
Pelvic Floor Physical Therapy for Recurrent UTIs: Bower WF, et al. Pelvic-floor therapy in girls with recurrent urinary tract infections and dysfunctional voiding. BJU International. 1998.
Divine K, McVey L. Physical Therapy Management in Recurrent Urinary Tract Infections: A Case Report. Journal of Women’s Health Physical Therapy. 2021.
Vaginal Estrogen for UTI Prevention: Raz R, Stamm WE. A controlled trial of intravaginal estriol in postmenopausal women with recurrent urinary tract infections. New England Journal of Medicine. 1993.
Lethaby A, et al. Local oestrogen for vaginal atrophy in postmenopausal women. Cochrane Database of Systematic Reviews. 2016.
Cranberry for UTI Prevention: Williams G, et al. Cranberries for preventing urinary tract infections. Cochrane Database of Systematic Reviews. 2023.
