phix - I 100% agree with gramps - it doesn't matter how young or old you are, if you have unexplained/unexpected chest pain you NEED to get in to see a doctor ASAP.
I have dealt with something similar, it's called "costochondritis" for me it started in the middle of the chest, and hurt like heck when I did anything with my arms that pulled on the chest. Costochondritis, based on my doctors info, is where the tissue connecting your ribs to your sternum becomes inflammed. For me, if I press anything on that area during a flare up it feels as if I'm pushing really hard on an area I have a bruise. The "treatment" for costochondritis is normally anti-inflammitory medication, like aleeve or motrin. For me putting an ice pack on that area for about
10 minutes would numb it enough it didn't hurt so bad.
Seriously though, make an appointment with your doctor, chest pain is not something to play with.
"When we come to the edge of the light we know, and are about to step off into the darkness of the unknown, of one thing we can be sure; either God will provide something solid to stand on... or we will be taught to fly.'"
"Cause when push comes to shove You taste what you're made of, You might bend, till you break Cause its all you can take; On your knees you look up Decide you've had enough, You get mad you get strong Wipe your hands shake it off, Then you Stand" From "Stand" by Rascal Flatts
Dx.: Polycystic Ovarian Syndrome, Ulcerlative Colitis, Chronic Inflammation of the Colon, Ruptured & Fused L4-L5-S1 w/pinched nerves, Degenerative Disc Disease, Chronic Costochondritis, Back Muscle Spasms, Asthma, Benign Tremmors (hands)