A heart attack, or myocardial infarction, is typically characterized by severe chest pain, but is often accompanied by difficulty breathing. Myocardial infarction is an acute and serious heart disease. The main cause is a sudden interruption of blood circulation in the myocardial vessels, resulting in severe loss or necrosis of the myocardium in the area corresponding to the blood supply. The main symptom of myocardial infarction is a widespread and severe pain in the chest that shifts to the upper right side, with radiating pain that spreads to the shoulders, arms, neck, teeth, stomach, abdomen, and back. Myocardial infarction pain is often accompanied by dyspnea, chest tightness, cold sweating, vomiting, and dizziness, and the pain is not relieved by rest, and in severe cases, there may be loss of consciousness, arrhythmia, drop in blood pressure, and even shock. Myocardial infarction is more common in smokers, history of high blood pressure, family history of the disease, history of diabetes, obese patients. Once myocardial infarction is detected, prompt treatment is required, which usually includes drug thrombolysis, coronary artery balloon dilatation, and so on. Patients with myocardial infarction will have symptoms of dyspnea. If the symptoms of myocardial infarction, it is recommended to consult a doctor in time to avoid missing the best treatment time.