Persistent pain in the left chest and left back for more than ten days cannot be accurately determined as to what disease it is, and may be due to angina pectoris, pneumonia, herpes zoster, other diseases, and so on. 1. Angina pectoris: a disease caused by imbalance of blood supply to the heart, the disease manifests itself as tightness and pain in the chest, patients will feel a sense of constriction, the symptoms may involve the left chest and left back, etc., and lasts for a long time. If angina is identified, sublingual nitroglycerin is recommended as soon as possible. 2. Pneumonia: it is an inflammatory disease that occurs in the lungs. When the localized foci of pneumonia invade, the symptoms of pain in the left chest and the left back may occur, and the symptoms will be aggravated when taking a deep breath, often accompanied by coughing and coughing up sputum, etc. The causative agent should be identified. Pneumonia need to clarify the type of causative organism, and then follow the doctor’s prescription oral cephalosporin, penicillin and other drugs to fight infection. 3. Herpes zoster: mainly due to the infection of herpes zoster virus, when the virus invades the nerves and skin will cause neuralgia, manifested in the left chest and left back pain. When the pain is more intense, you can take oral ibuprofen, gabapentin and other medications as prescribed by the doctor to relieve pain. In addition, the left chest and back persistent pain for 10 days, may also be frozen shoulder, cervical spondylosis, pleurisy, etc., should go to the hospital as soon as possible, and cooperate with the doctor to carry out the relevant examination, a clear diagnosis, active treatment. The above drugs need to be used in a standardized manner under the guidance of a doctor.