Researchers have discovered changes that take place in the brains of people who have Alzheimer's disease. These brain changes may cause the memory loss and decline in other mental abilities that occur with Alzheimer's disease. It's not fully understood why these brain changes occur in some people but not in others.
Alzheimer's disease gets worse over time, but the course of the disease varies from person to person. Some people may still be able to function relatively well until late in the course of the disease. Others may lose the ability to do everyday activities very early on.
- The disease tends to get worse gradually. It usually starts with mild memory loss. It progresses to severe mental and functional problems and eventual death.
- Symptoms sometimes are described as occurring in early, middle and late phases. It's hard to predict how long each phase will last.
- The average amount of time a person lives after developing symptoms of Alzheimer's disease is 8 to 10 years.
A person with severe dementia becomes more vulnerable to other illnesses, such as pneumonia.
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