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Angina pectoris refers to chest pain due to heart disease. Your heart is made up of muscles that contract to pump the blood throughout the body. These muscles themselves are fed by the blood vessels called the coronary arteries. Insufficient blood supply to the heart muscles with regards to the demand, most commonly due to the problems of the coronary arteries, results in the symptom of chest pain called angina. The other causes of angina include anemia(decreased oxygen-carrying capacity of the blood), abnormalities of heart rhythms, and heart failure. The chest pain feels like squeezing or heaviness in the center of the chest. You may also feel pain or discomfort along the jaw, arm, and back.