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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Alzheimer’s disease is a progressive brain disease and the most common dementia diagnosis in older adults. Memory problems are often an early sign, but Alzheimer’s can also affect language, judgment, reasoning, mood, and behavior. A change in memory does not by itself establish Alzheimer’s: other health conditions and medicines can affect thinking, too. A health care provider can assess concerning changes and discuss care options.
What is Alzheimer’s disease?
Alzheimer’s changes the brain over time and can gradually interfere with a person’s ability to remember, think, communicate, and manage everyday activities. The National Institute on Aging (NIA) estimates that more than 6 million Americans age 65 and older may have Alzheimer’s; most affected Americans are in that age group. NIA also identifies Alzheimer’s as the seventh leading cause of death in the United States. These are U.S. estimates and rankings, not a prediction about any one person. NIA: What Is Alzheimer’s Disease? (reviewed March 4, 2025)
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What are the signs of Alzheimer’s disease, and when should someone see a doctor?
Memory problems are often among the first signs, but symptoms vary. Possible changes include repeatedly asking the same question, difficulty planning or solving problems, trouble handling money, losing track of dates or location, difficulty finding words, or problems understanding visual images and spatial relationships. Confusion and behavior changes may become more pronounced as the disease progresses. These examples are not a diagnostic checklist. NIA: What Are the Signs of Alzheimer’s Disease? (reviewed October 18, 2022)
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Occasionally forgetting a name or where you put something can happen with age. More concerning is a pattern of worsening changes that disrupts daily life—for example, repeatedly losing track of familiar tasks, dates, or places, or having increasing trouble managing responsibilities. That pattern still does not prove Alzheimer’s; only a health professional can assess the possible causes.
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When is a medical assessment appropriate?
Speak with a health care provider when memory or thinking changes are persistent, worsening, or interfering with everyday activities. Alzheimer’s should not be assumed from one symptom. Other possible contributors include stroke, tumors, Parkinson’s disease, sleep problems, medication effects, infections, and other dementias. A provider can consider the person’s symptoms and health history and decide what evaluation is appropriate. NIA Alzheimer’s disease fact sheet
What are the stages of Alzheimer’s?
NIA describes preclinical changes and three clinical stages. The framework helps explain how needs may change, but it is not a precise timetable: the length and pattern of progression differ among people. Brain changes can begin a decade or more before noticeable symptoms, and those changes do not mean every person will develop dementia. NIA: signs and stages
| Stage | What it can involve |
|---|---|
| Preclinical | Brain changes may be present before noticeable symptoms. This is not a guarantee that dementia will develop. |
| Mild (early) | Memory loss may disrupt daily life; a person may repeat questions, struggle with planning or money, lose track of dates or location, or get lost. |
| Moderate | Confusion and memory problems may worsen, withdrawal may occur, and the person may need more supervision. |
| Severe (late) | Some people lose the ability to communicate, develop swallowing difficulties or loss of bowel or bladder control, and depend on others for care. |
These are possible features, not a checklist that everyone follows. A person’s abilities and support needs matter more for care planning than assigning a stage from a list.
How is Alzheimer’s disease treated?
There is no known cure. Medicines may help manage symptoms, and anti-amyloid medicines can slow decline for some eligible people with early Alzheimer’s; neither approach restores lost cognition or stops the disease for everyone. The choice is a clinician-guided decision, not a choice among interchangeable consumer products. NIA: How Is Alzheimer’s Disease Treated?
| Approach | Who it may be considered for and goal | Important considerations |
|---|---|---|
| Symptom-managing medicines | Cholinesterase inhibitors—including donepezil, rivastigmine, galantamine, and benzgalantamine—are used for symptoms in mild-to-moderate Alzheimer’s. Memantine can be used in moderate-to-severe disease. | Some medicines may temporarily improve or stabilize cognitive or behavioral symptoms; benefit varies. Do not start, stop, or switch a medicine without the prescriber. |
| Anti-amyloid immunotherapies: lecanemab and donanemab | Approved for early Alzheimer’s. Studies involved people with early Alzheimer’s or mild cognitive impairment due to Alzheimer’s and found slower cognitive decline among some participants over 18 months, along with reduced brain amyloid. | They require evaluation for amyloid and MRI monitoring. Amyloid-related imaging abnormalities (ARIA) can involve brain swelling or bleeding and can rarely be serious or life-threatening. Medicare Part B covers part of the cost for patients meeting certain medical criteria; confirm eligibility and coverage with the treating team and insurer. |
The NIA treatment page does not give a publication or review date in the available page information. Approvals, monitoring advice, and coverage details can change; the treating team and insurer can confirm what applies to an individual.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How can I help someone with Alzheimer’s?
Support needs can arise at any stage and change over time. Ask the person, when possible, what help they want, and adapt assistance to their abilities and safety needs. Everyday support may involve communication, activities, bathing, dressing, grooming, supervision, or help with daily tasks. NIA provides guidance on these topics as well as common medical concerns. NIA Alzheimer’s caregiving
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Build a support network before a crisis
It is appropriate to ask for help at any point. Family and friends, community or nonprofit organizations, faith communities, and support groups may be part of a support network. Depending on the person’s needs and local availability, options can include respite care, adult day care, in-home care, meal services, long-term care, or hospice. NIA: Getting Help With Alzheimer’s Caregiving
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When wandering or getting lost is a concern, consider how the home and daily routines can be adapted for the individual; any alarm or identification aid is a safety measure, not a treatment or substitute for appropriate supervision. As mobility declines, do not guess at safe transfers or repositioning. Ask the health care provider about referrals or resources: a physical or occupational therapist, home health aide, or nurse can demonstrate appropriate techniques. Movement and positioning may help prevent stiffness and pressure sores. NIA: Care in the Last Stages of Alzheimer’s Disease
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