Why is my cheek puffing when playing french horn?

Question

Okay so I've been playing horn for about 5 years and I started practicing today and my right cheek kept puffing out and I couldnt help it. This has never happened to me before and I'm kinda concerned because it's a lot harder to play.

Answer 1

The distention suggests a condition sometimes called "glassblower's disease", and could be a manifestation of Ehlers-Danlos syndrome.  You should very definitely see your doctor about this.

Answer 2

maybe you should ask your doctor about it