Dementia, or Alzheimer’s disease, in which the patient talks to himself every day may be in the middle to late stage. The early stage of Alzheimer’s disease, i.e. mild dementia stage, is mainly characterized by memory loss, especially near memory loss. Moderate Alzheimer’s disease is mainly characterized by behavioral and psychiatric abnormalities, with patients experiencing symptoms such as irritability, excitability, increased speech, loss of sense of shame, loss of numeracy, loss of recognition, and loss of use. In the advanced stage of Alzheimer’s disease, there are often emotional indifference, crying and laughing, loss of speech, bedridden, and inability to take care of themselves. Therefore, Alzheimer’s disease patients talking to themselves every day are in the middle and late stages of dementia. When Alzheimer’s disease patients talk to themselves every day, it is recommended that they go to the neurology department of a regular hospital in a timely manner, and under the guidance of specialists to carry out rehabilitation therapy in order to slow down the progression of the disease.