Dementia state is a kind of cognitive dysfunction, the patient is generally clear, after the onset of the patient’s early memory function decline, including the decline of near-memory is obvious, and at the same time there is an impaired ability to think, but also can appear cognitive loss or cognitive impairment can be manifested as hallucinations, delusions, do not recognize their own loved ones, go out of the door do not recognize the door of the house, the late stage may cause life can not take care of themselves, etc., but generally The patient’s mind is clear. Some patients may have psychiatric symptoms, such as irritability, excessive excitement, and restlessness.