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Alzheimer’s disease is a progressive brain disease and the most common dementia diagnosis in older adults. Memory loss is often an early sign, but changes in language, judgment, spatial understanding, mood, or behavior can also occur. There is no known cure; treatments may help manage symptoms, and some people with early Alzheimer’s may be eligible for medicines that slow decline. If changes are interfering with everyday life, a health care provider can assess them and look for possible causes.
This U.S.-focused guide explains common signs and stages, what treatment can and cannot do, and ways to support someone as care needs change. It is general information, not a diagnosis or an individual treatment plan.
What are the signs of Alzheimer’s disease?
Memory problems are typically among the first signs, but Alzheimer’s can affect more than memory. Symptoms vary from person to person, and one symptom alone does not establish a diagnosis.
- Forgetting recently learned information, repeating questions, or having memory loss that disrupts daily life.
- Difficulty planning, solving problems, handling money, or completing familiar tasks.
- Trouble finding words, understanding visual images or spatial relationships, or keeping track of dates and location.
- Getting lost, becoming confused, or experiencing changes in judgment, mood, or behavior.
Occasional forgetfulness can happen with age. A more concerning pattern is persistent change that makes everyday activities—such as managing finances, following plans, or navigating familiar places—harder. This distinction is a reason to seek an assessment, not a way to diagnose Alzheimer’s at home. The National Institute on Aging’s overview of Alzheimer’s signs describes these examples and notes that symptoms can differ between people.
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When should someone with memory problems see a doctor?
Arrange an appointment with a health care provider when memory or thinking changes are persistent, worsening, or interfering with daily life. Bring examples of what has changed, when it began, how often it happens, and how it affects routine activities. If possible, a family member or trusted person who has observed the changes can help describe them.
Do not assume that memory problems mean Alzheimer’s. Other conditions and factors—including stroke, tumors, Parkinson’s disease, sleep problems, medication effects, infections, and other dementias—can affect memory and thinking. The NIA Alzheimer’s disease fact sheet discusses other possible causes; a clinician can assess which explanations may apply.
What are the stages of Alzheimer’s?
The NIA describes a preclinical phase, followed by mild (early), moderate, and severe (late) clinical stages. Brain changes may begin a decade or more before noticeable symptoms, but not everyone with those changes develops dementia. The stages are a framework for understanding changing symptoms and support needs, not a precise timetable or a guarantee that every person will experience each example in the same way.
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|---|---|---|
| Preclinical | Alzheimer’s-related brain changes may be present before noticeable symptoms. | Brain changes alone do not show that a person will develop dementia; this stage is not defined by obvious day-to-day symptoms. |
| Mild (early) | Memory loss may disrupt daily life; a person may repeat questions, have trouble planning or managing money, lose track of dates or location, or get lost. | Help with planning, complex tasks, and safety may become useful while supporting the person’s independence where possible. |
| Moderate | Memory and confusion may worsen. The person may withdraw and need more supervision. | Daily assistance and supervision may increase as routines and activities become harder to manage. |
| Severe (late) | Some people may have difficulty communicating or swallowing, lose bowel or bladder control, and become dependent on others. | Care may involve extensive help with daily needs, mobility, positioning, and comfort. |
These are possible features, not a checklist. The NIA’s stage descriptions were content-reviewed October 18, 2022.
How is Alzheimer’s disease treated?
There is no known cure. Treatment decisions depend on the person’s condition, disease stage, medical history, and preferences. Symptom-managing medicines and anti-amyloid medicines have different goals, eligibility considerations, and burdens; they are not interchangeable consumer choices. Discuss benefits, risks, and monitoring with the treating team, and do not start, stop, or switch a medicine without the prescriber.
| Treatment type | Who it may be used for and goal | Important considerations |
|---|---|---|
| Cholinesterase inhibitors | Donepezil, rivastigmine, galantamine, and benzgalantamine are used to manage symptoms in mild-to-moderate Alzheimer’s. | Some symptom medicines may temporarily improve or stabilize cognitive or behavioral symptoms; effects vary and they do not cure the disease. |
| Memantine | May be used to manage symptoms in moderate-to-severe Alzheimer’s. | Its role is symptom management, not a cure; the prescriber can explain whether it fits an individual situation. |
| Anti-amyloid medicines | Lecanemab and donanemab are 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, alongside reduced brain amyloid. | Evaluation for amyloid and MRI monitoring are required. Amyloid-related imaging abnormalities (ARIA) can include 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 coverage with the treatment team and insurer. |
Anti-amyloid medicines are intended to slow decline for some eligible people; they do not restore lost cognition or cure Alzheimer’s. Treatment guidance and monitoring details are described by the NIA’s Alzheimer’s treatment page. Approval, eligibility, safety guidance, and coverage can change, so confirm current details with the treating team.
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How can I help someone with Alzheimer’s?
Support should fit the person’s abilities, preferences, and changing needs. NIA caregiver materials cover communication and behavior, meaningful activities, bathing and dressing, caregiver self-care, long-term care, and late-stage needs. A consistent routine and practical help with tasks the person finds difficult can support daily life; ask the person’s care team for advice tailored to their situation.
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As memory and judgment change, review daily activities, mobility, and home safety with the person and their care team. For someone at risk of wandering or getting lost, a door alarm may be considered as an optional alerting aid—not as a treatment, a prevention guarantee, or a substitute for supervision. The person’s specific risks and the home environment should guide any safety measure.
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Build a support network before a crisis
It is appropriate to ask for help at any stage. Family, friends, faith communities, support groups, and local community or nonprofit organizations may contribute. Depending on the person’s needs and local availability, options can include respite care, adult day care, in-home help, meal services, and—when appropriate—hospice. The NIA caregiving resource page and its guide to getting help with Alzheimer’s caregiving describe support resources. Availability, qualifications, and costs vary, so ask local providers what they offer.
Get professional guidance for late-stage movement and positioning
If the person has trouble moving or changing position, ask a health care provider for an appropriate referral or resource. A physical or occupational therapist, home health aide, or nurse can demonstrate safer movement and repositioning for that person. Movement and positioning can help prevent stiffness and pressure sores, but transfers should be guided by someone qualified to assess the person’s needs. See the NIA’s guidance on care in the last stages of Alzheimer’s disease.
How common is Alzheimer’s in the United States?
The NIA estimates that more than 6 million Americans age 65 and older may have Alzheimer’s disease, and identifies it as the seventh leading cause of death in the United States. These figures are from the NIA page content-reviewed March 4, 2025; they are population estimates, not an individual prediction. See What Is Alzheimer’s Disease?.
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