Left shoulder pain and numbness in the left hand are usually due to cervical spondylosis, frozen shoulder, and thoracic outlet syndrome. It can be relieved by general treatment, medication or surgery. 1. Cervical spondylosis: If it is caused by cervical spondylosis, non-surgical and surgical treatments are available. (1) Non-surgical treatments include cervical traction, cervical braking, cervical physiotherapy, improving poor working and sleeping positions, and adjusting the height of pillows. (2) Indications for surgical treatment include: intense radicular pain, ineffective conservative treatment; obvious compression of the spinal cord or nerve roots, accompanied by neurological dysfunction; symptoms are not very serious but conservative treatment is ineffective for half a year, or affecting the normal life and workers, surgical treatment, such as anterior discectomy, intervertebral implant fusion and so on should be adopted. 2. Frozen shoulder: If the pain in the left shoulder and numbness in the left hand is caused by frozen shoulder, non-steroidal anti-inflammatory drugs such as aspirin and acetaminophen can be used to relieve the pain, and the shoulder joint can be moved every day to restore the function and avoid muscle atrophy. 3. Thoracic outlet syndrome: If it is caused by thoracic outlet syndrome, you can have proper rest, local hot compresses, massage, and at the same time, use anti-inflammatory painkillers under the guidance of the doctor, such as naproxen, ibuprofen and so on. Conservative treatment is ineffective or the symptoms are more serious can be carried out thoracic outlet decompression surgery treatment to reduce compression. It is recommended that patients go to the hospital in time, check the left shoulder joint as well as the upper chest X-ray and CT of the cervical spine to identify the cause of the disease, to avoid the development of the disease, should be under the guidance of the physician to choose the use of medication, and avoid self-application of drugs.