Alzheimer's disease (AD) is a neurodegenerative disease that usually starts slowly and progressively worsens. It is the cause of 60–70% of cases of dementia. The most common early symptom is difficulty in remembering recent events. As the disease advances, symptoms can include problems with language, disorientation (including easily getting lost), mood swings,. Other assessment s, sometimes called measurements, appraisals, or tests, take place throughout the process. In general, mental health ... To decide whether a young person may be experiencing a psychotic disorder, a comprehensive, longitudinal assessment by a mental health professional is.