How to Actually Stop a Side Stitch

That sharp stab under your ribs has a real name: exercise-related transient abdominal pain, or ETAP. Researchers have studied it enough that we can separate what actually works from the stuff people just repeat.

Here's the honest version.

First, the myth worth dropping

You've probably heard that a stitch is your liver, and that you should breathe off your left foot to relieve it.

The liver explanation doesn't hold up. Stitches happen on both sides of the body, and slightly more often on the right. If it were your liver, that wouldn't make sense. The truth is researchers still debate the exact cause. The leading explanation is that the membrane lining your abdomen gets irritated as everything jostles around while you run.

So don't waste a stitch trying to remember which foot to breathe on. There are things that actually help.

The liver explanation is a myth. Stitches happen on both sides, slightly more often on the right.

What actually stops one, in the moment

These come from the research, and most work within seconds to a minute:

Slow down. A stitch is tied directly to how hard you're going. Ease off and it almost always fades. This is the single most reliable fix. Deep belly breathing. Shallow, panting breaths make it worse. Breathe deep into your belly, not your chest. Purse your lips and breathe out against them with your lungs fairly full. In one study this relieved the pain within seconds. Press and bend. Push your fingers into the sore spot and bend forward slightly. Tightening a belt or waistband around the area has also been shown to help. How to stop getting them in the first place Don't eat or drink much right before. This is the best-supported prevention by far. Large meals, and especially sugary or concentrated drinks, reliably bring stitches on. Give it a couple of hours. Build your core. Weaker abdominal muscles are linked to more stitches. Stronger ones seem to protect the area. Watch your posture. Slumping through your upper back is associated with more pain. Running tall helps. Ease in if you're new. Stitches hit beginners and younger runners hardest. They get less frequent as your body adapts, which is one more reason to start slow and let it happen. The reassuring part

A side stitch is harmless. The "transient" in the name is the whole point: it's temporary and tied to how hard you're pushing. It's not a sign of injury, and it goes away when you slow down.

One flag worth knowing: pain that doesn't ease within about 30 minutes of stopping, or that comes with fever or vomiting, isn't a normal stitch and is worth getting checked. Otherwise, it's just your body complaining, and slowing down is both the fix and the point.

Sources: Morton & Callister's review of exercise-related transient abdominal pain in Sports Medicine (2015), the standard reference on ETAP, drawn from their survey of 965 athletes across six sports.