Insufficient blood supply to the brain: 1. It can cause patients to be drowsy, sleepy and drowsy all day long. 2. Some patients are dizzy, causing symptoms of tightness and sinking of the head, sometimes like covering a pot, sometimes like wearing a very tight hat. 3. Some patients also have blurred vision, blurred and unclear symptoms of seeing things; some patients can also have transient double vision and transient blackness. Some patients may experience choking and coughing when drinking water; individual patients may also experience stiffness at the root of the tongue and inflexible speech; some may have numbness of the tongue and numbness around the mouth and lips. 5. Some people may experience dizziness, accompanied by weakness of both lower limbs. Sometimes both feet feel like stepping on cotton, walking unsteadily, like drunkenness, and easily fall down; there are also symptoms of limb weakness, weakness of one limb, weakness of a single limb, with or without numbness. 6. Unexplained falls, fainting, and transient loss of consciousness. All these symptoms of insufficient blood supply to the brain can trigger acute cerebral infarction.