Yeah..and it blows big moose cock!! Luckily mine is a mild case and with hard work and a little AAS use I have noticed it diminish somewhat. But if you have a serious case I would not recommend getting too big as it will surely accentuate it.
If it is mild, here's a site you might find interesting:
Its a concave of the chest, with the apex at the sternum. In some very slight, in others so severe it can put great strain on internal organs. Purely genetic condition, sometimes worsened by bad posture. It can be corrected with surgery, but its one nasty procedure