Our expert says:
It may be related to IBS, but I'm not an expert in that area so wouldn't want to offer an opinion based on my limited knowledge.
The other possibility is a side strain, which isn't too unusual. Perhaps the cramping during the run put excessive strain on your abs during the run, and with an hour or more of that, it's not inconceivable that you've slightly damaged the muscle. In that case, rest is the answer, anything that doesn't cause the pain.
Finally, without wishing to raise alarm unnecessarily, you may wish to consider seeing a doctor if the pain persists. The fact that it's a repeated problem, and feels different to a muscle pain may suggest something else, but again, that's not something I'd want to guess at.
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