Dementia is a cognitive condition resulting from a disease or injury and is characterized by memory problems, impaired reasoning, and personality changes. Patients with dementia exhibit manifestations of poor judgment, memory, and irritability. Impaired motor skills and lack of coordination are seen in movement disorders, such as Parkinson’s disease. Delusions and hallucinations are more typical of a psychotic illness, such as schizophrenia. Weight loss, fatigue, and hopelessness are more typical of major depressive disorder.