Does this happen to anyone else? Whenever a doctor asks me to breathe deep, I inhale smoothly, but my exhale is really quivery. I'm pretty sure it's the result of being nervous and/or excited, but the first time it happened I was really young, maybe 9 or 10 and it kind of startled me and was a little embarrassing (Being as my dad was in the room). I wondered if the doctor noticed it, I wondered what it sounded like in the stethoscope. I've never been told there was anything wrong, so I've always assumed this is normal.