Our expert says:
That's usually a breathing problem, or an eating problem. Breathing is normally the cause, because the most effective way to treat the stitch is to slow down your breathing, and breathe more deeply. You have to visualize the air being breathed all the way down to your belly button, as opposed to short, shallow breaths. That's why it's a problem with fitness, but it can just as easily affect super-fit people. So if you can correct your breathing, it might solve the problem.
The other thing is eating or drinking. If you eat or drink too close to training, then you can experience a stitch, presumably because of the weight of fluid/food in the stomach, putting pressure on the muscles that you use when you breathe.
So I'd say check your diet, and if you're happy that you're eating long enough before you train (say an hour) then just focus on deeper, more controlled breathing, long breath in, long breath out (as long as possible, that is).
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