Alzheimer's disease happens because of changes in the brain. Some of the symptoms may be related to a loss of chemical messengers in the brain, called neurotransmitters, that allow nerve cells in the brain to communicate properly.
People with Alzheimer's disease have two things in the brain that are not normal: amyloid plaques and neurofibrillary tangles. Experts don't know if amyloid plaques and neurofibrillary tangles are side effects of Alzheimer's disease or part of the cause.
What are the symptoms?
For most people, the first symptom of Alzheimer's disease is memory loss. Often the person who has a memory problem doesn't notice it, but family and friends do. But the person with the disease may also know that something is wrong.
The symptoms of Alzheimer's get worse slowly over time. You may:
A person who gets these symptoms over a few hours or days or whose symptoms suddenly get worse needs to see a doctor right away, because there may be another problem.
How is Alzheimer's disease diagnosed?
Your doctor will ask about your past health and do a physical exam. He or she may ask you to do some simple things that test your memory and other mental skills. Your doctor may also check how well you can do daily tasks.
The exam usually includes blood tests to look for another cause of your problems. You may have tests such as CT scans and MRI scans, which look at your brain. By themselves, these tests can't show for sure whether you have Alzheimer's.
How is it treated?
There is no cure for Alzheimer's disease. But there are medicines that may slow symptoms down for a while and make the disease easier to live with. These medicines may not work for everyone or have a big effect. But most experts think they are worth a try.