Costochondritis This condition can be very painful, some say they even thought they were having a heart attack! Well luckily when the pain started in my chest I was aware of this condtion so didn't panic, no pain went down my left arm, so felt pretty sure it wasn't a heart attack, but I still went to my doctor, so if you have chest pain you've never experienced before, please phone for help, 999, hospital, doctor....always better to be save than sorry.
Back to Costochodritis it is basically inflammation in the joints between the cartilage that connects your ribs to the sternum, basic painkillers and/or anti-inflammatory should help.