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Overview
What Is Alzheimer Disease?
Alzheimer disease is a progressive brain disorder that gradually affects memory, thinking, language, and the ability to manage everyday activities. It is the most common cause of dementia. It most often affects older adults, although younger-onset disease can occur. Learning what is Alzheimer’s disease and how it differs from other causes of dementia can help families seek appropriate evaluation and support.
Symptoms
Alzheimer Disease Symptoms
Alzheimer’s disease symptoms are more than occasional forgetfulness: they are persistent changes that interfere with work, relationships, or daily tasks. New or worsening memory and thinking problems should be evaluated, especially when family members notice a change. An assessment can identify Alzheimer disease and other conditions that may be treatable.
- Repeating questions or stories may occur because recently shared information is not remembered.
- Forgetting recent conversations, events, or newly learned information can be an early warning sign.
- Difficulty finding common words or solving familiar problems may affect communication and decision-making.
- Trouble completing familiar tasks, such as cooking or using appliances, can signal a change beyond normal aging.
- Frequently misplacing items or putting them in unusual locations may become noticeable.
- Changes in judgment, personality, or mood can affect safety, relationships, and usual activities.
How Symptoms May Progress
IMPORTANT
Memory problems can have other causes
As Alzheimer disease progresses, a person may need more help with bathing, dressing, eating, communication, and mobility, and may eventually lose the ability to manage daily activities independently. Depression, medication effects, sleep problems, thyroid disease, vitamin deficiencies, infections, and other conditions can also cause memory or thinking problems and may be treatable.
Causes
Causes of Alzheimer Disease
Alzheimer disease develops through interacting genetic, biological, and environmental factors rather than one simple cause. In an individual person, the precise reason the disease developed usually cannot be identified. Researchers continue to study how brain changes and health factors contribute to dementia of Alzheimer’s type.
BRAIN CHANGES
Abnormal amyloid plaques and tau tangles can build up in the brain, while inflammation and damage to nerve-cell connections develop over time. These changes can lead to the progressive loss of brain cells and communication between them.
CONTRIBUTING FACTORS
Age, inherited genetic variants, vascular health, lifestyle, and other biological factors may influence whether symptoms develop and when they appear. These factors affect risk but do not determine the outcome for any one person.
Risk Factors
Risk Factors for Alzheimer Disease
| Risk category | Examples |
|---|---|
| Nonmodifiable factors | Increasing age, family history, inherited genetic variants, and differences in risk associated with certain racial or ethnic groups. |
| Potentially modifiable health factors | High blood pressure, diabetes, depression, hearing loss, and other conditions affecting cardiovascular or brain health. |
| Potentially modifiable lifestyle and environmental factors | Smoking, physical inactivity, social isolation, and traumatic brain injury. |
Having an Alzheimer’s risk factor does not mean someone will develop the disease, and some people develop it without known risk factors. Managing health conditions and addressing changeable risks may support overall brain health, but it cannot guarantee prevention.
Complications
Complications of Alzheimer Disease
- Wandering or getting lost can create serious safety concerns.
- Falls may occur because of impaired judgment, balance, or mobility.
- Medication errors can happen when a person forgets doses or takes them more than once.
- Malnutrition or dehydration may result from forgetting to eat, drink, or prepare meals.
- Swallowing problems can increase the risk of choking and aspiration.
- Incontinence may develop and require additional personal care.
- Infections can become more likely when mobility, swallowing, or self-care declines.
- Sleep and behavior changes may include agitation, confusion, or disrupted day-night patterns.
- Loss of independence can increase the need for supervision and assistance.
- Caregiver stress may grow as care needs and safety concerns increase.
Planning ahead
Prepare for changing needs
Advance care planning, home safety changes, medication supervision, fall prevention, and nutrition support can reduce risks as needs change. Caregiver respite, support groups, and help from health and community services are also important parts of Alzheimer’s care.
Diagnosis
How Alzheimer Disease Is Diagnosed
No single test diagnoses every case of Alzheimer disease. Clinicians usually review the person’s medical and symptom history, ask family members or caregivers about changes, review medicines, and assess how thinking problems affect daily function. The evaluation also looks for other causes of cognitive change.
- Cognitive and neurological testing checks memory, attention, language, reasoning, movement, and reflexes.
- A physical and psychiatric assessment looks for medical, emotional, or behavioral conditions that may affect thinking.
- Blood tests can check for potentially reversible causes such as thyroid problems, vitamin deficiencies, or infection.
- Brain imaging, such as MRI or CT, may identify strokes, tumors, fluid buildup, or other structural changes.
Treatment & Management
Alzheimer Disease Treatment and Management
Alzheimer’s disease treatment cannot currently cure or reverse the condition, but it may help manage symptoms and support quality of life. Care can include medicines for selected stages or symptoms, treatment of other health conditions, safety planning, and structured support. Goals are adjusted as abilities and needs change.
MEDICAL TREATMENT
Clinicians may prescribe medicines that target cognitive symptoms or behavior for appropriate patients. Disease-modifying therapy may be an option for some people with early disease after careful evaluation of eligibility, benefits, risks, and monitoring needs.
DAILY CARE AND SUPPORT
Consistent routines, physical activity, cognitive and social engagement, good sleep, and treatment of hearing or vision problems can support daily function. Home-safety changes, caregiver education, and management of other medical conditions are also important.
Prevention
Can Alzheimer Disease Be Prevented?
Alzheimer disease cannot be completely prevented, and no strategy guarantees that a person will avoid it. However, controlling cardiovascular risk factors and supporting brain health may lower the chance of cognitive decline. Discuss personal prevention goals with a clinician, especially when other health conditions are present.
- Get regular physical activity appropriate for your health and abilities.
- Work with a clinician to manage blood pressure and diabetes.
- Do not smoke, and limit alcohol if you drink.
- Have hearing loss assessed and use recommended hearing support.
- Maintain regular social contact and mentally engaging activities.
- Eat a balanced diet with a variety of nutrient-dense foods.
- Use seat belts, helmets, and other measures to help prevent head injuries.
Outlook and Prognosis
Outlook and Prognosis
Alzheimer disease is progressive and currently has no cure, but the pace and pattern of decline vary widely. Care can address symptoms, safety, comfort, and quality of life throughout the illness. The outlook is influenced by overall health, other medical conditions, support needs, and how the disease affects the individual.
Phases and Changing Support Needs
When Should You See a Doctor
When Should You See a Doctor?
Make an appointment
Have persistent changes evaluated
Arrange a routine medical appointment for persistent or worsening memory loss, repeated questions, trouble managing familiar tasks, getting lost, personality or judgment changes, or concerns raised by family members. Evaluation can clarify whether symptoms are related to Alzheimer disease, another form of dementia, or a treatable condition.
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1 topic
Alzheimer Disease
Geriatrics
