I'm 22 years old and for about 2 weeks now the left side of my chest has been hurting on and off. Really it is almost more bothersome than painful, it's only a mild ache but still I would like to know what's causing it. It's mostly when I'm laying down for bed but sometimes when sitting or standing still but never when I'm active and lasts anywhere from a couple minutes to about an hour. I'm tired a lot too, but that really could have nothing to do with it, I'm always tired so it's hard to distinguish whether or not that is an additional symptom or not. In case it makes a difference I have high blood pressure (have for at least a year now, nothing new there), last time I checked a few days ago it was 176/98. If you have any ideas on what's causing this please let me know-- thanks!!!