The intermittent twitching pain in the back of the left side of the head may be caused by physiological conditions, or it may be caused by occipital neuralgia, vertebral artery entrapment, migraines and so on. 1. Physiological conditions: headache and dizziness can occur after intense exercise or physical labor and mental stress, generally through rest and relaxation can be relieved. 2. Pathologic conditions (1) Occipital neuralgia: common causes include cervical spondylosis, cervical spine tuberculosis, trauma, spinal cord tumor, osteoarthritis, cervico-occipital myositis, sclerosing spondylitis and metastatic tumor. It is characterized by one-sided persistent dull pain in the occipital region, which can be aggravated by paroxysm and aggravated by head and neck activities and coughing, often accompanied by cervical muscle spasm. (2) Vertebral artery entrapment: the main symptom of patients with vertebral artery entrapment is pain, most commonly in the back of the neck or occipital region, which may spread to the shoulder, or diffuse headache, most of which is occipital headache, requiring cerebrovascular intervention. (3) Migraine: common causes include heredity, nerve cell excitability disorder, endocrine metabolism, etc. It can be triggered by improper diet, stress, sensory stimulation, environmental changes, drugs, physical activity, lack of sleep, etc., resulting in headache, pain can be shifted from one side of the head to the other, and it can be fluctuating pain or throbbing pain. When the left back of the head intermittent twitching, you need to go to the hospital in time for examination, clear the cause of the disease and then symptomatic treatment.