Mrs. Wei, 82 years old, has been nagging and talking to people who have passed away in recent days, and can say that it is a certain person, standing right next to the bed, who has actually passed away for more than ten years. Sometimes she also said that there was a naked child in the bed, affecting her sleep; sometimes she said there were snakes and rats in the house, making the whole family very nervous, thinking that the old woman was suffering from mental illness. When she went to the hospital, there were no obvious abnormalities, except for multiple cranial CT foci. The doctor diagnosed her with ischemic mental disorder. The cause of its occurrence was related to insufficient blood supply to the brain. However, this condition is relatively rare in cerebral insufficiency of blood supply. The common symptoms of cerebral insufficiency are memory loss, insomnia, headache, dizziness, blurred vision and general weakness, which persist and are sometimes mild and severe. In addition to cerebral ischemia, symptoms of phantom hearing and vision can occur, Alheimer’s disease and schizophrenia can also have similar manifestations. However, these diseases have other psychiatric symptoms in addition to the symptoms of hallucinations and hallucinations, which are not sudden and persistent. If you find that an elderly person has sudden symptoms of hallucinations, you should see a neurologist immediately for a clear diagnosis and timely treatment. The function of the brain is very complex, and if there is a lesion in any part of the brain, there will be a corresponding performance. For example, if cerebral ischemia affects the emotional, visual and auditory centers and conduction fibers, the symptoms of hallucinations will appear. In our treatment experience, as long as early and correct treatment is given to improve the blood supply to the brain and restore the blood flow, the symptoms will disappear soon. In severe cases, anti-psychotic drugs can be used.