Why does yawning hurt so much?

I am a week post op, and I don't mean this question to sound as dumb as it does...but I have noticed that when I yawn, my stomach hurts on the inside. I know it is probably muscles, but sometimes from "information overload" so to speak (reading too much, putting ideas in your head LOL) I get scared that I might be hurting my new stomach or the staple line. I would appreciate any thoughts...be nice now, I said this was kind of a stupid question LOL. Thanks!

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