I have been constantly yawning and most times it feels like I can't get the full yawn I need and after awhile my chest hurts from the yawning & trying to get a complete yawn. What Does this mean?
Thank you,
Loretta2

I always thought it was due to a lack of oxygen. Are or were you ever a smoker?
This is fairly informative...
Yawn - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Yawn)