If a girl has pain above the left chest, the specific causes are as follows: 1. First, we should rule out whether the sternal fracture or left intercostal nerve damage caused by trauma, or the appearance of contusions and lacerations of the surrounding soft tissues. 2. Girls with pain above the left chest should consider whether there is lobular hyperplasia of the breast, mastitis, or breast tumor occupancy will also cause pain. 3. Girls with cardiac neurosis will also have pain in the left 4. Cardiogenic diseases, such as myocarditis, congenital heart disease, heart valve disease or hypertrophic obstructive cardiomyopathy, will have the above clinical symptoms and manifestations. 5. Respiratory diseases, such as severe lung infection, large pneumothorax or significant pleural effusion, will also have the above symptoms. 6. Some rare diseases, such as herpes zoster, will also cause painful sensation in the above mentioned areas.