Headache, poor memory and slow reaction may be a sign of lack of oxygen to the brain. In the case of middle-aged and elderly people, most of them are caused by insufficient blood supply to the brain, and most patients have hyperlipidemia and diabetes. Those with a history of hyperlipidemia and hyperglycemia generally have increased blood viscosity and slow blood flow. If the patient has hypertension it may cause damage to the intima of the blood vessels, which tends to cause the tangible components of the blood to collect in the walls of the vessels, making it easy to form atherosclerosis. Atherosclerosis causes narrowing of the lumen, stiffness of the walls, and poor elasticity of the blood vessels, which can easily lead to insufficient blood supply to the brain. If young people have insufficient blood supply to the brain, most of them are related to mental tension, stress and lack of sleep. If patients look down at the cell phone for a long time, play computer for a long time, long time ambulatory work may also cause, mainly relax, reduce stress, improve sleep. Normally, we should reduce the time to look at the phone and play computer, and if we need to work for a long time, we must pay attention to rest and combine work and rest.