Side Stitch While Running: What Helps?

A sharp ache under the ribs can turn an ordinary run into a walk. It is tempting to blame shallow breathing, then force a new breathing rhythm while trying to hold pace. The research gives runners less certainty about both the cause and the cure.

If the pain is familiar and mild, ease off first. If it is severe, unusual, or accompanied by other symptoms, stop running and use the medical guidance below rather than assuming it is a stitch.

Medical disclaimer: This guide is educational and cannot diagnose abdominal pain or clear you to continue exercising. See our medical disclaimer. A previous stitch does not establish the cause of a new episode.

What researchers mean by a side stitch

Exercise-related transient abdominal pain, or ETAP, describes localized pain associated with activity. A 2015 Sports Medicine review describes pain near the side of the abdomen and rib border, sometimes sharp and sometimes aching. Trained athletes can experience it too.

Its mechanism remains unresolved. The review considers irritation of the abdominal lining a plausible explanation, while noting that further research is needed. It does not establish weak abs, poor posture, or a particular breathing pattern as the cause of your pain.

A breathing rule cannot diagnose or prevent it

In a small treadmill study, 28 stitch-susceptible participants underwent lung-function testing; 14 developed a stitch. Inspiratory performance was not reduced during the episode. The authors concluded that the diaphragm did not appear directly implicated, although a small study cannot settle every mechanism.

That finding does not prove breathing exercises never help someone feel more comfortable. It does weaken the confident story that a stitch means your diaphragm has run out of oxygen. There is no basis here for prescribing a universal foot-strike/exhalation pattern as a proven cure.

Our editorial advice is to let comfortable breathing follow an appropriate effort. Do not force breath-holding or keep a painful run going to complete a breathing drill. Recurrent unexplained breathlessness deserves medical assessment rather than self-treatment as a stitch.

What to do during a familiar, mild episode

Slow to a walk or stop. The 2015 review describes relief techniques as inconsistent and much management advice as anecdotal.

A 1999 experiment tested physical maneuvers in just seven participants after a drink provoked pain. Bending forward with abdominal tightening and breathing through pursed lips helped in that setting. This is limited experimental support, not a dependable treatment protocol for every runner.

If comfortable, you can try a gentle forward lean and relaxed, unforced breathing while stationary. Stop the maneuver if it hurts. Avoid digging hard into your abdomen or forcing a stretch through pain. These are cautious editorial suggestions, not a validated sequence.

End the run if symptoms persist or return when you try to resume. There is no requirement to salvage the planned miles. Pain that does not resolve warrants assessment.

Test your pre-run routine without abandoning fuel

The review identifies eating beforehand and concentrated drinks as potential provocations. It discusses avoiding large food or fluid volumes in the two hours before exercise as a commonly proposed strategy, with limited evidence for a universal prevention rule.

The 1999 fluid experiment involved ten young men drinking substantial, body-mass-adjusted volumes before repeated hard treadmill bouts. All tested fluids initially provoked pain. That setup does not establish that a normal sip of sports drink during a marathon will cause a stitch.

For recurrent mild episodes, our editorial approach is to record meal size and timing, drink type, effort, and when the pain starts. On a later easy run, change one aspect of that routine rather than eliminating breakfast and fluids together. A pattern in a log can guide a conversation with a clinician; it cannot confirm a diagnosis.

Keep practiced race fueling in view. Our race-day stomach guide covers broader gastrointestinal problems, and the marathon-wall guide explains why avoiding fuel has its own costs. A stitch is not a reason to improvise a fasted marathon.

When abdominal pain needs care

The NHS abdominal-pain guidance recommends urgent assessment for pain that worsens, persists, or keeps returning. Seek medical care for those patterns, including pain outside running. Do not repeatedly label them ETAP without an evaluation.

Emergency red flags include sudden or severe abdominal pain, marked tenderness to touch, vomiting blood, bloody or black sticky stools, breathing difficulty, or collapse. Stop running and seek emergency care; in the U.S., call 911 when emergency help is needed. Do not press or stretch a tender abdomen to test whether the pain goes away.

Chest discomfort, unusual shortness of breath, cold sweat, or lightheadedness can also signal a heart attack. Follow American Heart Association advice: call 911 for possible heart-attack symptoms, even when you are unsure.

Sources

• Morton and Callister, Sports Medicine (2015): Exercise-related transient abdominal pain. Research review; uncertain mechanisms and limited management evidence.
• Morton and Callister, International Journal of Sports Physiology and Performance (2006): Spirometry during ETAP. Small primary study of lung function during symptoms.
• Plunkett and Hopkins, Medicine & Science in Sports & Exercise (1999): Stitch after fluid ingestion. Small primary fluid and maneuver experiments; limited generalizability.
• NHS: Stomach ache. Persistent-pain assessment and emergency warning signs; emergency access adapted for U.S. readers.
• American Heart Association: Warning signs of a heart attack. Emergency symptoms and calling 911.

Sources checked October 19, 2026. Research findings are attributed above; the run-stopping workflow and routine log are editorial recommendations, not a proven prevention or treatment protocol.