For the past few weeks, I've had a pain in my chest. It has been localized to a pretty small area (left side, above my breast). I'd compare the pain to that of a bruise. I would only notice it if I breathed deeply. Today, I noticed I've been a little short of breath. I realized I wasn't really able to take deep breaths and I've been feeling a sensation of wanting to yawn a lot too. As for my medical history, I'm a 24 year old female. I am 5'10" and weigh 200 pounds. I smoke and have been at various frequencies for about 7 years now. About a month ago, I noticed I was smoking more than usual and have been trying to cut back. I was up to about a pack every 3 to 4 days. I was wondering if this is serious enough to need to go to the hospital and also what it could be. Thanks.