Hiding and making noises are almost always a symtom of pain. Even if he did not yelp when you picked him up,he can still have a painful issue. It is also possible that he was spooked by one of the other cats.
Examine his entire body and mouth for foreign objects,broken teeth, etc. Pay special attention to his tongue and pads.
If you see nothing and he does not develope any symptoms of illness in the next couple of hours -and he is eating, drinking and pottying normally - you can safely assume it was stress induced.
However, continue to watch him VERY carfully for anything unusual.
Please let me know if you find anything on him and how he is doing in a few hours.
Dedicated to Cats and the people who love them!
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