The pain in the chest when exercising may be caused by the following two reasons: 1, the need to breathe deeply when exercising, or breathing harder and sharper, resulting in strain on the soft tissues between the ribs, this situation generally stop exercising and then rest for a period of time, the symptoms will gradually improve. This situation is generally related to the thoracic force and breathing, when the thoracic force or deep breathing, the pain will appear or aggravate. 2, acute heart disease problems, such as common is angina or acute myocardial infarction, this situation in addition to chest pain, but also accompanied by chest tightness, palpitations or general weakness, pale and cold sweat and other phenomena. If the above situation occurs, you should immediately go to the hospital for urgent examination and related treatment.