My weird and completely unscientific theory on side stitches that occur when you first start running (not like beginning of an individual run, but early in getting into the habit of running) have something to do with the fact that the tissue that holds all of your organs in place isn't initially strong enough to deal with all of the bouncing. No idea if that's really possible or true, but I have LOTS of side stitches every time I re-learn how to run and they diminish over time, though they occur more often running downhill.
Belly breathing is supposed to help and can at least reduce it enough that I can keep going. Slowing down and smoothing out my stride helps a little, too. But I don't know how to make them go away entirely - they've always just sort of done that on their own as running becomes more regular and my body adapts to it.



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