Meh, it could be ANYTHING! Do a "breast check" for lumps... Chances are, that's not it, but it's always good to check!
If it's a sharp pain BEHIND the breast, chances are it's gas... It's not uncommon to have sharp chest pains (left side) from gas, in which case some "Pink Stuff" will help... Sorry, I don't remember what the "pink stuff" is called! But it should help!
If that doesn't work, and it's happening often, call the doctor to check for other things!
at 11:53 AM on Dec. 14, 2009