Alzheimer's Disease

What Is It?

Alzheimer's disease (AD) is a loss of brain functions that worsens over time. It is a form of dementia.

Alzheimer's disease damages the brain's intellectual functions. Short term memory often is affected early. Gradually other intellectual functions deteriorate. Judgment becomes impaired. Most people with advanced AD lose their ability to do normal daily activities.

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »