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Slightly off topic but (nearly) two years ago my father had a bad stoke. They keep him in a drug-induced coma for a week. Prior to the stroke his hearing was pretty bad. Loud TV, etc.

In any case, after the stroke I swear his hearing wasn't as bad. I didn't have to talk as loud. He would hear more of what was said even when it wasn't directed at him. I have no idea if his hearing is better but all the signs that said it was bad don't say that as much as often.

There are some conditions, like cranial nerve VII (facial nerve) palsy, where hyperacousis is a symptom. You have a couple muscles in your ear that attenuate sound, so it's not out of the realm of possibility that something happened to your father and his hearing improved.

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