MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Angina or heart attack. Man clutching his chest in pain due to angina or a heart attack (myocardial infarction). The severe chest pain characteristic of both conditions is caused by a lack of blood, and consequently oxygen, to the muscle of the heart. Restricted coronary blood supply is commonly due to the narrowing of coronary arteries by fat deposits, known as atherosclerosis. Angina can be brought on by exertion or stress, and may be relieved by rest. A heart attack causes lasting damage to heart muscle, and can be fatal. Both conditions may require drugs and surgery.
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