![]() In less than 1% of cases, Alzheimer's is caused by specific genetic changes that almost guarantee a person will develop the disease. Scientists believe that for most people, Alzheimer's disease is caused by a combination of genetic, lifestyle and environmental factors that affect the brain over time. The neurons become damaged and lose connections to each other. This disrupts the work of brain cells, also called neurons, and triggers a series of events. But at a basic level, brain proteins fail to function as usual. The exact causes of Alzheimer's disease aren't fully understood. In the brain of someone with Alzheimer's disease, amyloid plaques form and tau proteins change shape and become tangles. Healthy brain and brain with Alzheimer's disease If you are concerned about thinking skills you observe in a family member or friend, talk about your concerns and ask about going together to talk to a health care professional. If you are concerned about your memory or other thinking skills, talk to your health care professional. When to see a doctorĪ number of conditions can result in memory loss or other dementia symptoms. These skills may be preserved longer because they're controlled by parts of the brain affected later in the course of the disease. Preserved skills may include reading or listening to books, telling stories, sharing memories, singing, listening to music, dancing, drawing, or doing crafts.
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