Alzheimer's disease is a progressive form of dementia that causes problems with memory, thinking, and behavior. It develops due to factors such as age, family history, and genes. Symptoms usually develop slowly over time and include difficulty remembering new information as well as disorientation and mood changes. There is no cure for Alzheimer's but available treatments can temporarily slow symptoms and improve quality of life. Maintaining brain health through a healthy lifestyle may help reduce risks of developing Alzheimer's.