Alzheimer's disease is a form of dementia that slowly destroys memory and thinking skills. It is caused by changes in the brain and gets worse over time. The main risk factor is increasing age, and family history and genetics also play a role. Symptoms include memory loss, problems with thinking and language, and behavioral changes. Currently, there is no cure for Alzheimer's, and available treatments can only temporarily slow the worsening of symptoms. The number of people with Alzheimer's is expected to rapidly increase worldwide in coming decades as the population ages.