The causes of shoulder expansion left chest pain are muscle strain and angina and other diseases, shoulder expansion left chest pain treatment methods include local hot compresses, taking anti-inflammatory analgesic and anti-tuberculosis drugs. 1. Muscle strain: may be in the exercise body, too much force lead to shoulder expansion left chest muscle strain, resulting in shoulder expansion left chest pain. Local hot compresses can be used to promote blood circulation in the strained tissues. In serious cases, you can follow the doctor’s instructions to use topical pain relieving creams, such as diclofenac diethylamide emulsion, flurbiprofen gel paste, and so on. 2. Costal chondritis: patients can be induced by infection, exertion and other factors, which can be manifested as shoulder expansion and left chest pain. The disease is self-limiting, it is recommended to apply local hot compresses, and oral ibuprofen capsules can be taken to relieve pain when the pain affects work and rest. 3. pleurisy: there are tuberculosis, non-specific bacterial infection caused by pleurisy, can also be manifested as shoulder expansion left chest pain. Pleurisy caused by tuberculosis infection should be treated with oral isoniazid and rifampicin. Non-specific bacterial infections can be treated with oral cefoperazone and moxifloxacin. There are many reasons that lead to shoulder expansion and left chest pain, it is recommended that patients go to the regular hospital in time to identify the cause of the disease and give treatment, and follow the doctor’s instructions for medication.