Back pain, chest tightness and shortness of breath are mainly seen in the following causes: 1, coronary heart disease, insufficient blood supply to the heart, such patients may have previous risk factors such as smoking, hypertension, hyperlipidemia, diabetes, etc., and develop under walking and other activities, examination of ECG and cardiac ultrasound helps to make a clear diagnosis; 2, lung diseases, such as pneumothorax, pneumonia, pulmonary embolism and other diseases, can also have such symptoms, but patients often may have cough, coughing and other characteristics of lung diseases at the same time, examination of chest CT, pulmonary artery CTA, etc. helps to make a clear diagnosis; 3, psychosomatic factors, patients are often nervous and anxious, some patients may be accompanied by stress and sleep deprivation, routine cardiopulmonary examination is often normal; patients should be encouraged to improve their living habits, exercise regularly, and psychological guidance if necessary, which helps to improve symptoms.