Left vertebral artery occlusion may be caused by congenital dysplasia, which does not require treatment; it may also be caused by arteriosclerosis or cervical spondylosis, which requires medication or surgery. If the left vertebral artery occlusion is caused by congenital dysplasia, if the right vertebral artery has a normal diameter and is able to maintain normal blood supply to the brain, it can be left untreated and untreated. If the left vertebral artery occlusion is caused by atherosclerosis, antiplatelet aggregating drugs such as aspirin and clopidogrel, as well as anticoagulants such as rivaroxaban and dabigatran, should be used under the guidance of a doctor. Patients with severe vertebral artery stenosis can also be treated with stenting, percutaneous endoluminal balloon dilatation, and bypass grafting. Patients with cervical spondylosis can have vertebral artery occlusion due to compression of vertebral artery by osteophytes and disc herniation, and in severe cases, patients can undergo surgical treatment under the guidance of the doctor, such as anterior cervical discectomy, decompression and internal fixation of the vertebral canal, and so on. Patients with left-sided vertebral artery occlusion need to consult a doctor in time. If it is caused by congenital developmental abnormality, there is no need for treatment. If it is caused by a disease, the doctor will choose the appropriate treatment for the cause. In addition, the patient needs to have proper physical exercise every day, and cannot smoke or drink alcohol.