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Angina or Angina Pectoris (Latin for squeezing of the chest) is chest pain, discomfort, or tightness that occurs when an area of the heart muscle is receiving decreased blood oxygen supply. It is not a disease itself, but rather a symptom of coronary heart disease, the most common type of heart disease. The lack of oxygen rich blood to the heart is usually a result of narrower coronary arteries due to plaque buildup, a condition called atherosclerosis. Narrow arteries increase the risk of pain, coronary artery disease, heart attack and death.