Dementia has become a widespread illness, with the number of cases continuously rising. How can one recognize the gradual onset of dementia? Initial signs include noticeable changes in behavior and experience, as well as reduced performance. These symptoms are illustrated through typical case examples. Following this, an overview of examination methods and the diagnostic classification of different forms of dementia is provided. Current findings and hypotheses regarding risk factors and causes are discussed. Finally, treatment and care measures are presented, along with clarification of legal questions. This is what you should know! Thinkers and topics in profile: clear - concise - concrete.