Consider cervical spondylosis, muscle strain, lymphadenitis, tumor, etc. Drug treatment, physical therapy and surgery should be taken for the cause of the disease. 1. Cervical spondylosis: it can cause pain and activity limitation of the tissues around the cervical vertebrae, which can be treated with traction, acupuncture, medium frequency pulse and other physical therapy, oral nimesulide, methylcobalamin and other medications. 2. Muscle strain: Considering that it is related to long time head bowing and other bad postures, it can take massage or local hot compresses to relax the neck muscles and relieve the pain, and it can also be applied with muscle relaxing drugs such as Clozoxazone or Eperisone. 3. Lymphadenitis: If there are localized hard nodules, the inflammation of lymph nodes is mostly considered. If it is a bacterial infection, antibiotics such as cefadroxil and roxithromycin can be applied; if it is a viral infection, antiviral drugs such as acyclovir are needed to treat it. If an abscess is formed, incision and drainage of pus are also needed. 4. Tumor: lymph node metastasis caused by Hodgkin’s lymphoma or gastric cancer can cause lymph node swelling and pain, which can be clarified through puncture biopsy and other tests, and comprehensive treatment can be given. There are many other reasons for the pain on the left side of the neck, so it is necessary to go to the hospital in time for examination to clarify the cause of the disease, and under the guidance of the doctor, treatment should be carried out according to the cause of the disease. All of the above medications need to be used under the guidance of a doctor.