Insufficient blood supply to the brain refers to a series of disorders of brain function caused by insufficient blood supply to a certain part of the human brain. The causes of cerebral insufficiency are generally considered to be related to cerebral atherosclerosis. The consequences of cerebral insufficiency are summarized in the following aspects: First, dizziness, especially sudden dizziness, blurred vision, visual rotation, and even nausea and vomiting. Second, transient numbness of limbs, sudden numbness of one side of the face or hands and feet, sometimes manifested as numbness of the tongue or lips, temporary slurring of words and speech, followed by improvement. Third, weakness or inflexibility of the limbs, which is actually a manifestation of hemiplegia. Fourth, temporary loss of consciousness, or sudden change in personality or intelligence, or sudden falls or stumbles of unknown origin. Fifth, general weakness, limb weakness, memory loss, not remembering what happened in the morning but not in the afternoon, or not remembering what happened in the morning but not the next day, these are all consequences of insufficient blood supply to the brain.