How to stop stomach cramps while running
If you have ever pulled up mid-run clutching your side or your gut, you are not alone — and the good news is that learning how to stop stomach cramps while running is mostly about timing, hydration and what you ate beforehand, not about your fitness level. There are really two different problems people lump together: a sharp "side stitch" under the ribs, and a churning, gassy gastrointestinal (GI) cramp lower down. They have different causes, and both are fixable.
The honest short answer: stop eating large or high-fat, high-fibre meals in the two to three hours before you run, start your run already hydrated rather than chugging fluid on the move, and keep practising — your gut adapts to running far more than most people expect.
What helps your runs feel better most?
Browse the rangeSide stitch vs GI cramps — two different things
A side stitch (its formal name is exercise-related transient abdominal pain) is that stabbing pain just under the ribs, usually on the right. The leading explanation is irritation of the membrane lining the abdominal cavity, made worse by a full stomach and jarring movement. A lower, crampy, urgent-feeling pain that comes with bloating or the need for a toilet is GI distress — your digestive tract being shaken and under-supplied with blood while you run.
The distinction matters because the fixes differ. A side stitch responds to slowing down, deep "belly" breathing and pressing on the spot; GI cramps respond to changing what and when you eat and drink.
What the science actually says
Hydrate before, not just during. Sports-nutrition guidance is to start exercise already well hydrated rather than relying on drinking mid-run (Thomas et al., 2016). Sloshing a large volume of plain fluid into your stomach during a run is a classic trigger for both stitches and nausea.
Sodium matters when you rehydrate. After a sweaty session, drinking only plain water makes you urinate more and leaves you in a net fluid deficit; including sodium helps you actually retain the fluid (Shirreffs et al., 1996). This is why a proper electrolyte mix beats plain water for longer or hotter runs. OstroVit Pure Electrolytes 270g and PowerBar 5 Electrolytes 10tabs Raspberry-Pomegranate are the kind of simple sodium-plus-potassium options worth keeping in the kitchen — browse the electrolytes range.
Don't overdrink. It is counter-intuitive, but in the Boston Marathon 13% of runners finished with low blood sodium (hyponatremia), and the single biggest risk factor was gaining weight during the race from drinking too much (Almond et al., 2005). Sip to thirst; you do not need to be drinking constantly.
Fuel timing for long runs. For efforts over about an hour, 30–60 g of carbohydrate per hour supports performance (Thomas et al., 2016), but cram that in too fast or too concentrated and the gut rebels. Practise your fuelling in training, not on race day.
Practical takeaways
| Symptom | Likely cause | Quick fix |
|---|---|---|
| Sharp pain under ribs | Side stitch | Slow down, exhale on the opposite foot-strike, press the spot |
| Lower crampy/gassy pain | GI distress | Empty stomach pre-run, cut fibre/fat beforehand |
| Nausea + sloshing | Too much fluid at once | Pre-hydrate, sip small amounts |
| Cramps in heat/long runs | Sodium loss | Use an electrolyte drink, not plain water |
- Leave 2–3 hours between a full meal and a run; for early runs, a small low-fibre snack works better than a big breakfast.
- Start hydrated; sip, don't gulp.
- Use electrolytes for hot or long sessions.
- Avoid new foods, gels or high doses of caffeine before a hard run — caffeine at training doses helps performance but can loosen the gut in sensitive people.
- Build gut tolerance gradually; "gut training" is real.
For structured pre-run energy without sugar overload, a measured pre-workout can help — explore the pre-workout range. All of these are available at maxfit.ee.
Training your gut so cramps stop coming back
Here is the curious part most runners never hear: your digestive system is trainable, just like your legs. The gut adapts to the mechanical jostling of running and to absorbing fluid and carbohydrate on the move. Athletes who deliberately practise drinking and fuelling during sessions tend to tolerate far more in races without distress, because the stomach learns to empty faster and the intestine ramps up its capacity to absorb. This is exactly why a gel or drink that wrecks your stomach on week one can feel completely fine by week six — nothing about the product changed, your gut did.
The practical version is simple. Pick one drink and one fuel source and rehearse them on your long runs only, never on race day. Start with small, dilute amounts and build up. If a particular sweetener (especially the sugar alcohols in some sugar-free gels) reliably upsets you, switch it out — fructose and sorbitol are common culprits for the lower, gassy kind of cramp. Over a few weeks, most people find the cramps they assumed were permanent simply fade.
Stress and breathing matter too. Shallow, panicked breathing tightens the core and can feed a side stitch, while a relaxed, rhythmic breathing pattern — exhaling as the opposite foot strikes the ground — reduces the repeated tug on the abdominal lining. If you tend to start runs too fast, easing into the first kilometre also gives blood flow time to settle into a steady pattern rather than being yanked between your gut and your legs.
References
- Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). American College of Sports Medicine Joint Position Statement: Nutrition and Athletic Performance. Medicine & Science in Sports & Exercise, 48(3), 543–568. https://pubmed.ncbi.nlm.nih.gov/26891166/
- Shirreffs, S. M., Taylor, A. J., Leiper, J. B., & Maughan, R. J. (1996). Post-exercise rehydration in man: effects of volume consumed and drink sodium content. Medicine & Science in Sports & Exercise, 28(10), 1260–1271. https://pubmed.ncbi.nlm.nih.gov/8897383/
- Almond, C. S. D., Shin, A. Y., Fortescue, E. B., et al. (2005). Hyponatremia among Runners in the Boston Marathon. New England Journal of Medicine, 352(15), 1550–1556. https://pubmed.ncbi.nlm.nih.gov/15829535/
FAQ
Why do I only get a side stitch on one side?
Side stitches most often strike on the right, where the liver sits, and are linked to a full stomach and the jarring of running. Slowing down and breathing deeply usually settles it within a minute or two.
Should I drink water during a short run?
For runs under an hour, starting hydrated is usually enough and gulping water can actually trigger cramps. Sip to thirst, and save structured electrolyte drinking for longer or hotter efforts.
Can what I eat the night before cause cramps?
Yes. A very high-fibre or high-fat dinner can still be in your system the next morning. If you cramp on early runs, try a lighter, lower-fibre evening meal.
