Acute pericarditis - In this the chest pain is intense, sharp and positional. Usually the pain is relieved after changing the posture. Acute myocardial infarction - Chest pain is developed similar to that of Angina. This condition develops due to the development of abdominal or thoracic aorta. Usually a silent disease, this causes severe diffused chest pain.
Heart is a large muscular organ which pumps blood in and out of it.
If it is not able to get enough oxygen from its own blood supply, it will develop a cramping pain. The failure to provide enough oxygen is due to the narrowing coronary arteries formed by the deposition of a fat like substance arethoma. This type is called Angina pectoris - Pectus means muscle of chest. Usually a person will come to know that he or she is having angina only after several episodes have occurred, and a pattern has evolved. The level of activity or stress that provokes the angina is somewhat predictable, and the pattern changes only slowly.