Left shoulder pain with back pain for six months may be frozen shoulder, rotator cuff injury, acromioclavicular arthritis, etc., which can be treated with medication, rehabilitation training or surgery. 1. Frozen shoulder: Frozen shoulder is a sterile inflammation of the shoulder joint, the main symptom is shoulder pain, you can take non-steroidal anti-inflammatory drugs, such as meloxicam, etoricoxib, you can also carry out the closed treatment, mainly lidocaine, triamcinolone acetonide, etc., and in addition to functional exercises, such as wall climbing method, Laren method. 2. Rotator cuff injury: rotator cuff injury is caused by trauma and repetitive motion, which will cause pain in the shoulder joint area. If the symptoms are mild, try to have more rest, in addition, you can use the stent or plaster to fix it, and if the symptoms are more serious, you should undergo the surgical treatment, including the open surgery and arthroscopic surgery. 3. acromioclavicular arthritis: acromioclavicular arthritis is a sterile inflammation of the acromioclavicular region, which can also cause shoulder pain. Oral non-steroidal anti-inflammatory drugs can be used to improve the symptoms, such as ibuprofen, meloxicam, and if the effect of conservative treatment is not good, surgical treatment is also needed, and arthroscopic surgery is more commonly used to remove the diseased tissue. Left shoulder pain with back pain for six months should be sought as soon as possible to identify the cause of the cause of treatment, if you need to use drugs, should strictly follow the doctor’s instructions.