My coworker was completely silent and didn't talk at all during his entire shift. is he ok?

the only time I heard him talk was when it involved work related duties. he didn't even say bye nor let anyone know that he was on break.

he looked annoyed sometimes. I hope he's ok?
Update: @ANON. don't be a stupid a.hole. our job requires us to get along.

maybe learn from my concern rather than be defensive and immature
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