A left vertebral artery diameter of less than 2.5 millimeters is called a left-sided vertebral artery fibrillation. Left vertebral artery fibrillation may be caused by atherosclerosis, vertebral artery stenosis, dysplasia, or due to cervical spondylosis caused by compression of blood vessels. There are two vertebral arteries in the human body, the left and right vertebral arteries, which start at the upper wall of the first segment of the subclavian artery and travel upward to supply the brain. If it is caused by atherosclerosis, control the risk factors, can be recommended by the doctor to take anti-platelet aggregation, plaque stabilization and other drugs; by the vertebral artery moderate to severe stenosis caused by the interventional surgery can be given to balloon dilatation and stent implantation treatment; by congenital dysplasia caused by, no special treatment. For left-sided vertebral artery fibrillation caused by cervical spondylosis compressing blood vessels, physical methods can be adopted for treatment, such as maxillo-occipital band traction, circumferential collar and neck brace. When left-sided vertebral artery fibrillation is detected, it is recommended to consult a physician in time for intervention and treatment under the guidance of the physician.