The doctors cannot find anything wrong with my heart, but it is in the region of the heart that I feel a discomfort close to dumb pain - maybe in front of heart, close to chest bones. It started after I increased to 40 minutes the time I used to run on the treadmill - before that I ran not more than 30 mins. Then, I took a week off, during which I did not run but only walked, and the chest pain disappeared. I resumed my workouts gradually increasing the time of running, but the pain appeared again, now after 20 minutes of running. I gave up running on treadmill for a whole month and the pain disappeared completely, but when I resumed and gradually increased the running time, the pain re-appeared after 10 minutes. It is long since this became a permanent condition which prevents me from excercising. Can anybody recommend something to treat this?