disease by describing the neuropsychiatric symptoms that occur during the course of the disease and by systematically reviewing the prevalence of these symptoms. Neuropsychiatric symptoms of Alzheimer's disease are symptoms that include personality changes, mood disorders, motor activities disorders, and many others, and which, in addition to the patient himself, can be noticed by third parties (doctors, caregivers, etc.). Also, the symptoms negatively affect not only the patients, but also people around them (from the family, caregivers, the care system for the sick, and society as a whole). The paper presents Alzheimer's disease in general and its neuropsychiatric symptoms, through their definition, description, method of treatment, measurement and grouping. Also, the paper presents the prevalence of neuropsychiatric symptoms, and the findings obtained by systematic analysis of available studies are compared with the findings of previous studies. Thus, the most prevalent were the symptoms of apathy, depression and irritability, and the least prevalent were the symptoms of euphoria and hallucinations, which was in line with the findings of previous studies (with minor deviations, which are also shown in the paper). Given the expected increase in the elderly in society, and thus those suffering from various types of dementia (of which Alzheimer's disease is the most common), it is expected that interest in both the disease itself and its symptoms will also grow.