Left shoulder pain and difficulty in lifting the left hand may be caused by frozen shoulder, trauma, cervical spondylosis, etc. Corresponding treatments for different causes include conservative treatments and surgical treatments. 1. Frozen shoulder: it is a kind of shoulder joint inflammation caused by chronic strain, which will cause limited shoulder joint activities. Non-steroidal anti-inflammatory drugs (diclofenac sodium, ibuprofen, etc.) can be used to alleviate pain and reduce inflammation, and glucocorticoid (prednisolone acetate) can be used for pain injection to alleviate the pain, and if the treatment is ineffective or aggravated, shoulder arthritis release can be carried out to improve the function of the joint. 2. Trauma: If there is a history of trauma or muscle strain caused by exertion, you should go to the hospital for X-ray examination in time to see if there is any fracture or dislocation of the shoulder joint. If there is any fracture or dislocation, it should be treated and fixed by manipulation or surgery. If there is no fracture or dislocation, you can use safflower oil or Yunnan Baiyao ointment to apply locally, and you can also take ibuprofen to reduce inflammation and relieve pain. 3. Cervical spondylosis: cervical spondylosis can cause neck-shoulder syndrome, which can cause shoulder pain and activity limitation, medication includes non-steroidal anti-inflammatory drugs (celecoxib, ibuprofen, etc.), nutritive nerve medication (vitamin B, methylcobalamin, etc.), if conservative treatment is ineffective you can use decompression to relieve the compression of the nerves and spinal cord. There may be other reasons for left shoulder pain and difficulty in lifting the left hand, so it is recommended that the patient should consult a doctor in a timely manner to clarify the cause of the disease and take appropriate treatment measures. Patients should avoid blindly using drugs on their own.