DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Angina or heart attack. Computer artwork of a man clutching his chest during angina pectoris or a heart attack. The image shows the heart muscle glowing yellow indicating pain. Angina is a feeling of severe pain and constriction in the chest. The pain spreads to the left shoulder and arm as in a heart attack. Both conditions are caused by a deficiency in the oxygen supply to the heart muscle. The lack of oxygen is usually caused by obstruction of the coronary arteries due to the formation of fatty atheroma plaques within them (atherosclerosis). In a heart attack the heart muscle is damaged, which can be fatal. Both conditions may require drugs or surgery.
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