I have this mild heart condition, a mitral valve prolapse. I found out about it because one day, my chest hurt. Badly. Very very badly, through to my back. Went to the doctor, they rushed me into the emergency room, and quickly found the problem.
Thing is? My condition is incapable of causing the pain. I was so scared and upset that I tensed up. I tensed so much that it caused rather extreme pain, all through my chest. It lasted for days after. All generated by anxiety.