Learning what Alzheimer’s disease is and how it affects the brain is an important first step for families facing these conditions.
When you understand the changes behind the symptoms, it becomes easier to make sense of daily challenges and to support both the person living with dementia and the caregiver.
The overview below breaks down the basics: what’s happening in the brain, how those changes show up in everyday life, and why early evaluation and support can make a meaningful difference.
What is Alzheimer’s disease?
Alzheimer’s is a disease of the brain that affects memory, thinking, behavior, and the ability to complete everyday activities.
Alzheimer’s disease is the most common cause of dementia. It is not a normal part of aging.
The disease develops gradually and becomes more serious over time. Although there is currently no cure, an early and accurate diagnosis can help people explore treatment options, make plans, address safety concerns, and find support.
Alzheimer’s and dementia are not the same thing
Dementia is a general term for problems with memory, thinking, reasoning, or behavior that interfere with everyday life. Alzheimer’s disease is one condition that can cause dementia.
Other causes include vascular dementia, Lewy body dementia, and frontotemporal dementia. Some people have brain changes associated with more than one type, known as mixed dementia.
What happens in the brain with Alzheimer's disease?
Alzheimer's damages nerve cells and the connections between them. Changes may begin years before symptoms become noticeable.
Two of the best-known brain changes are:
- Tau tangles, abnormal changes inside nerve cells
- Amyloid plaques, abnormal buildups of protein between nerve cells
The disease often begins by affecting areas of the brain involved in learning and memory. As it progresses, it can affect language, reasoning, judgment, movement, behavior, and the ability to care for oneself.
What are the symptoms of Alzheimer’s?
Alzheimer’s affects every person differently. Memory loss is common, but it is not always the only or earliest change.
Possible symptoms include:
- Difficulty remembering recently learned information
- Repeating questions or stories
- Trouble planning, solving problems, or managing money
- Difficulty completing familiar tasks
- Confusion about time or place
- Problems finding words or following conversations
- Misplacing belongings and being unable to retrace steps
- Changes in judgment
- Withdrawal from work or social activities
- Changes in mood, personality, or behavior
Having one or more of these symptoms does not necessarily mean someone has Alzheimer’s. Medication side effects, infections, sleep problems, depression, thyroid conditions, vitamin deficiencies, and other health concerns can also affect memory and thinking.
Who is at risk of developing Alzheimer’s?
Age is the greatest known risk factor, but Alzheimer’s is not an inevitable part of growing older.
Most people with Alzheimer’s develop symptoms after age 65. Younger people can also develop the disease. When symptoms begin before age 65, it is often called younger-onset or early-onset Alzheimer’s.
Family history and genetics can affect risk, but having a relative with Alzheimer’s does not mean that a person will develop the disease. Overall health, environmental factors, and lifestyle may also play a role.
Healthy habits cannot guarantee that Alzheimer’s will be prevented, but taking care of your heart and overall health may help reduce the risk of cognitive decline.
Learn ways to support brain health and reduce dementia risk
How does Alzheimer’s progress?
Alzheimer’s is often described in three general stages, although changes do not always follow a predictable timeline.
- Mild or early stage
- A person may remain independent but begin having difficulty with memory, organization, word finding, finances, driving, or other complex tasks.
- Moderate or middle stage
- Memory loss and confusion become more noticeable. The person may need help with daily activities and may experience changes in sleep, mood, judgment, communication, or behavior.
- Severe or late stage
- The person needs extensive assistance with personal care and daily activities. Communication, movement, eating, and swallowing may become more difficult.
A person living with Alzheimer’s is more than a diagnosis. Abilities, preferences, relationships, and moments of connection remain important throughout every stage.
Is there treatment available for Alzheimer’s?
There is currently no cure for Alzheimer’s, but treatment and support can improve quality of life.
Some medications help manage memory, thinking, agitation, and other symptoms. Newer treatments may modestly slow the progression of Alzheimer’s in certain people during the early stages of the disease. These treatments are not appropriate for everyone and require specialized testing and monitoring.
Daily routines, meaningful activities, physical activity, social connection, good nutrition, treatment of other health conditions, and caregiver support are also important parts of care.
How is Alzheimer's diagnosed?
There is no single evaluation that is right for everyone. A health care provider may:
- Review medical history, medications, and changes in daily functioning
- Speak with the person and someone who knows them well
- Assess memory, language, attention, and problem-solving skills
- Perform physical and neurological examinations
- Order blood or other laboratory tests
- Use brain imaging or Alzheimer's biomarker tests when appropriate
A thorough evaluation can help identify Alzheimer's or another cause of the symptoms, including conditions that may be treatable.
When should I talk with a doctor about memory changes?
Schedule an appointment if changes in memory, thinking, judgment, or behavior are interfering with everyday life. Consider bringing specific examples and asking a trusted family member or friend to attend.
Seeking an evaluation does not mean assuming the diagnosis is Alzheimer's. It is a step toward understanding what is happening and what help may be available.
You do not have to navigate Alzheimer’s alone
Alzheimer’s of Central Alabama helps people living with dementia and the families caring for them. We provide practical guidance, caregiver education, support groups, adult day care scholarships, dementia care scholarships, Project Lifesaver bracelets, and connections to community resources.
Call ACA: (866) 806-7255 or (205) 871-7970
Email: aca@alzca.org
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Sources
The information on this page is based on current guidance and research from trusted sources, including the National Institute on Aging and the Centers for Disease Control and Prevention. It is intended for educational purposes only and should not replace personalized medical advice. If you have concerns about Alzheimer’s disease, memory changes, or treatment options, please talk with your doctor or another qualified healthcare professional.
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