Are you sure it's chest and not right under the ribs in the abdomen? Right upper quadrant pain can have any of a number of causes, and can be tricky. The gallbladder is there, also a big turn in the colon that can cause pain from gas, etc. I have three slipping ribs there, but that was from a wreck and "seat belt rash."
But I'm no doctor! Better discuss this with yours!!