Heart attack left shoulder pain is characterized by the presentation of paroxysmal colicky pain that usually lasts no more than half an hour. Patients with myocardial infarction experience angina with radiating pain, and angina is an early warning signal from the heart to the body. When the blood supply to the heart muscle is insufficient, the heart sends out pain signals, which are transmitted from the afferent nerves to the central nervous system, which then transmits them through the efferent nerves to the body surface. Angina-induced left shoulder pain is characterized by paroxysmal cramps, mainly centered on the left shoulder, which may also radiate to the left upper arm and even the fingertips. In addition, the pain may cause numbness in the face and hands, and is accompanied by symptoms such as chest tightness, shortness of breath, and dyspnea, and usually lasts no more than half an hour. Generally rest or sublingual nitroglycerin can relieve the symptoms of left shoulder pain. If the patient does not get relief from the symptoms after taking nitroglycerin for 15 minutes and there is a tendency for the left shoulder pain to worsen gradually, he/she should consult a doctor for effective treatment under the guidance and advice of a doctor.