Dementia refers to Alzheimer’s disease, which is a disease of insidious onset and chronic progression, and there is no authoritative method of self-testing. There is no authoritative self-test for Alzheimer’s disease. However, the following symptoms should alert you to the possibility of the disease. The diagnosis of Alzheimer’s disease needs to be made by a professional doctor. 1. Memory loss: Patients may have a significant decline in memory function, especially for near memory loss is more obvious, far memory is relatively preserved, manifested as often forget to turn off the gas, forget the phone number, say the same thing over and over again, and some patients may also have some mental anomalies, which can be clarified through the dementia scale score. 2. Behavioral abnormalities: patients with this disease may have some strange behaviors, not recognizing their old friends, recognizing their relatives, not being able to go back to their own home after going out, and so on. 3. Inability to take care of oneself: patients with advanced stages of the disease may experience a complete loss of cognitive function and may eventually be unable to take care of themselves, including dressing, eating, brushing teeth and washing their faces, all of which have to be carried out by others. Alzheimer’s disease is a neurodegenerative disease with slow progression, progressive aggravation and irreversibility, therefore, once suspected of similar manifestations, it should be consulted as soon as possible.