Heart attack is medically known as acute myocardial infarction. Patients with mild acute myocardial infarction may show signs such as weakness and chest discomfort, but they are not absolute. Patients with mild acute myocardial infarction usually have no signs before the onset of the disease, but some patients may have symptoms such as weakness, chest discomfort, palpitations, shortness of breath, irritability, and discomfort in the precordial area a few days before the onset of the disease. The extent of the disease varies from patient to patient, so it is impossible to generalize the exact signs. Patients may experience pain in the precordial area, tightness in the chest, shortness of breath, coughing, dyspnea, confusion, night sweats, cold extremities, and a drop in blood pressure; the pain may also radiate to the back of the sternum, the left side of the ribs, and the epigastric region. If the above symptoms occur, it is recommended that the patient go to the Department of Cardiovascular Medicine for examination and treatment.