Chest pain and dyspnea may be caused by myocardial infarction, pneumonia or lung cancer. 1. Myocardial infarction: Myocardial infarction will cause chest pain and dyspnea during the attack, which is caused by myocardial ischemia. This disease is caused by myocardial ischemia. Some patients also have digestive symptoms such as epigastric distension, vomiting and nausea. 2. Pneumonia: Pneumonia is usually caused by lung infections, and patients will cough up sputum, cough, chest pain and other symptoms. Patients will also suffer from generalized symptoms such as generalized pain and fever, and when the disease is serious, it will damage the lungs and cause difficulty in breathing. 3. Lung cancer: Lung cancer in the middle and late stages of the disease will also cause chest pain and dyspnea. In the early stage of the disease, patients may have no discomfort. Chest pain and dyspnea may also be caused by rib fracture, pulmonary embolism and other diseases, and patients should go to hospital for examination and treatment in time.