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I don't know how bad it is, but he needs to also work on prevention. As a gamer, he most likely has a lot of very bad sitting habits.

Yeah, this as well. Serious neck pain really needs to get checked.

A quick tip would be to watch how high he has his shoulders. They need to be relaxed and low. If they're not, it will lead to tensing of the traps, most likely causing neck pain.

That's one way...