Our expert says:
I'm not sure. I've never heard of it before, though it doesn't sound implausible. It may be that he's strained muscles, and this could produce the same symptoms. It's the timing that is interesting, just after eating. Might be that stomach distension and just the presence of food aggravates a stomach strain, or intercostal strain.
I'd back off the training, for a week, and then assess. As you say, if it continues, then look at a proper diagnosis, but if stopping training for a short time resolves it, then no problem. And just ease more gradually into the training next time and it should be OK.
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