Our expert says:
Is it a stitch? That happens mostly as a result of breathing, because of a spasm in the diaphragm. The solution is to slow the breathing rate, breathe more deeply and therefore to slow running for a while.
If it's not this, then it might be a muscle strain, but that's something you'd only really know if you felt it suddenly. And does it happen all the time, only infrequently?
If it's there all the time, then it is unlikely to be a stitch, but a muscle strain, in which case rest and avoiding pain are key, let it recover and then resume.
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