Sudden chest pain afraid to breathe may be associated with angina, pneumothorax, pulmonary embolism and other diseases. 1. Angina pectoris: insufficient blood supply to the coronary arteries, caused by acute ischemia and hypoxia of the myocardium. Episodes of chest pain and chest discomfort are the main symptoms, which may radiate to the neck, pharynx, jaw and other parts of the body, accompanied by dyspnea and other symptoms. 2. Pneumothorax: caused by gas entering into the pleural cavity, most of the cases start sharply, with sudden chest pain on the affected side, cut-like or needle-like, chest tightness and dyspnea, often accompanied by cough and other symptoms. 3. Pulmonary artery embolism: most patients will experience dyspnea, the symptoms are obvious after activity, sometimes manifested as sudden onset of chest pain, aggravated by coughing. Sudden chest pain dare not gasp for air there are other causes, it is recommended that patients seek timely medical attention to identify the cause of the disease, active treatment.