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	Pain in the chest area that radiates towards the shoulder and left arm, can be triggered by a deficiency in the blood supply to the heart. The heart muscle's oxygen and nutrient requirements are then, especially during physical exertion, no longer met. The main cause is the occlusion of the coronary vessels due to atherosclerosis, which can lead to a partial or complete blockage of the blood-flow. Angina pectoris and heart attacks are often triggered by blood clots (conglomeration of blood platelets) formed in the coronary vessels. When a pain or pressure and tightness in the chest area makes itself suddenly felt under physical exertion and subsides in a period of rest, one talks of angina pectoris. Often, angina pectoris attacks are precursors to heart attacks. A heart attack occurs, when the supply of oxygen and nutrient-rich blood to the heart muscle is reduced or cut off completely, resulting in a sharp pain in the chest area. If the blood supply is cut off for a long time, the effects will be irreparable or even deadly. In case pain occurs in the chest area or left shoulder and left arm without clear cause, you should definitely see your doctor for treatment.