What causes pain on the left side of the back of the head

The patient has pain on the left side of the head, which is considered to be caused by primary greater occipital neuralgia, cervical spondylosis, or intracranial organic lesions. It is recommended that the patient go to the hospital for MRI and other related examinations to clarify the cause. If it is caused by greater occipital neuralgia, the patient can take carbamazepine and other drugs as prescribed.