The initial symptoms of Alzheimer’s disease are characterized by memory loss, spatial impairment, easy fatigue, and personality disorders. 1. Memory loss. In the early stages of the disease, near memory loss occurs, which is characterized by the forgetting of things that are often done. As the disease progresses, distant memory loss occurs, which is characterized by forgetting the names of familiar people and places. 2. Spatial disorder. This is manifested by the inability to find the way home after going out. 3. Fatigue. Tiredness of new things or complicated things, accompanied by negative emotions. 4. Personality disorder. Patients may show symptoms such as selfishness, suspiciousness, irritability, easy to anger and so on. Patients with the above symptoms should consult the doctor in time to avoid delay in treatment.