The Seven Stages of Alzheimer’s: Symptoms and What to Do

Alzheimer’s disease unfolds gradually, across a spectrum of seven stages, from a period with no noticeable symptoms at all, to a final phase requiring round-the-clock care. Understanding where someone falls on that spectrum can help patients, caregivers, and families make informed decisions, plan ahead, and find the right support at the right time.

The seven-stage model, developed by geriatric psychiatrist Dr. Barry Reisberg at NYU Langone Health, remains one of the most widely used frameworks for describing Alzheimer’s progression. Here’s what each stage looks like and what research suggests you can do as a person living with Alzheimer’s or a caregiver.

What are the seven stages of Alzheimer’s disease?

Alzheimer’s disease is the most common form of dementia, a term for conditions that cause memory loss and other cognitive decline severe enough to interfere with daily life. According to the Alzheimer’s Association, more than 7 million Americans are currently living with Alzheimer’s.

The seven stages range from Stage 1 (no impairment) to Stage 7 (very severe decline). The early stages may last years before noticeable changes occur. The later stages require increasing levels of care and support.

Stage 1: No impairment — What does this look like?

In Stage 1, a person has no noticeable symptoms. Memory and cognitive function appear completely normal to the individual and to those around them.

The only way to detect Alzheimer’s disease at this stage is through brain imaging, such as an MRI or amyloid PET scan, which can identify the abnormal protein deposits, like amyloid plaque, associated with the disease before symptoms begin.

What you can do at Stage 1:

Start by exercising 30–40 minutes, five times per week, to support your brain health. Research suggests regular aerobic exercise may help clear amyloid buildup in the brain. Find an exercise routine that is easy for you to stick to.

Building brain-healthy eating habits is also vital at this early stage. The Mediterranean diet and the MIND diet (a hybrid of Mediterranean and DASH eating) have both been associated with reduced risk of cognitive decline. Both diets prioritize fish, fruits, veggies, whole grains and extra virgin olive oil.

Understand your risk by learning the difference between Alzheimer’s disease and normal aging, and remember that not all forgetfulness signals disease. Dr. Barak Gaster discussed three warning signs of cognitive decline, including getting lost in familiar places.

Talk to your doctor if you are concerned about your memory, or have a family history of Alzheimer’s or other risk factors.

Stage 2: Very mild decline — Is this normal aging or something more?

At Stage 2, a person may begin to notice small memory lapses, such as misplacing keys, forgetting a word, feeling like their memory isn’t quite what it used to be. Importantly, these changes are not yet visible to others, and the person still performs well on formal cognitive tests.

For many people, Stage 2 reflects normal aging rather than Alzheimer’s disease. However, it’s a useful moment to establish a cognitive baseline.

What you can do at Stage 2:

At this stage, experts recommend challenging your brain with new types of learning like a new instrument, a new language, or an unfamiliar skill. Sticking to a regular exercise program and building memory support habits with the use of calendar alarms, Post-it reminders, and by keeping consistent routines can also provide brain benefits.

Taking a baseline cognitive test to give you a record of your baseline function now will make future changes easier to track.

Speak with a medical professional about whether enrolling in a clinical trial might be appropriate for your situation. There are clinical trials that are preventative and don’t require a diagnosis of cognitive decline, like the POINTER study.

Stage 3: Mild decline — When should you see a doctor?

Stage 3 is when cognitive changes become noticeable to family and close friends, even though the person may not yet have a formal diagnosis. 

This stage often corresponds to what clinicians call mild cognitive impairment, or MCI — a condition that research suggests may precede Alzheimer’s in some, but not all, people. MCI can be caused by a variety of conditions and does not always progress to Alzheimer’s disease.

Signs that may appear in Stage 3:

Memory issues begin to be noticeable at this stage, especially by friends and family members,

At this stage, it’s also common for people to forget the names of new acquaintances, to lose items, including valuables, and to ask the same question repeatedly within a short time frame.

At this point, brain fog and loss of executive function may appear, including loss of words during conversation, difficulty with planning and organizing, and having difficulty completing complex tasks, like following a recipe. Performance on standardized memory tests tends to fall below baseline normal.

What you can do at Stage 3:

It’s crucial to stay socially active and engaged — social connection is consistently linked to better cognitive outcomes in research.

Family members and friends may have noticed unusual behavior and be concerned if you are alright. After you consult with a physician, come up with a plan for sharing the situation with family and friends. Your loved ones may wonder how they can best support you during this time. One of the best ways to live a high-functioning life with cognitive decline is to work with your family to establish organized routines.

Read about the latest research and consider whether clinical trial participation makes sense. Sign up for our quarterly trials update newsletter.

If you’re experiencing mild decline, consider documenting your values, memories, and wishes through audio recording, video, or a letter. This can help your family make an informed plan about how to handle the final stages of decline, while also giving them an audio recording from you to cherish.

Caregiving can be a challenging but eye-opening journey. Make sure you express gratitude to the people in your support system — the caregiving journey ahead will be meaningful for everyone involved.

Stage 4: Moderate decline — What is a formal Alzheimer’s diagnosis?

Stage 4 typically corresponds to an official diagnosis of early-stage Alzheimer’s disease. 

At this point, a physician can identify the condition through a clinical interview and cognitive evaluation.

Signs that may appear in Stage 4:

At this point, a person may experience increasing memory problems, like forgetting details from their personal history. Their short term memory may start to decline, paired with difficulty to complete tasks in their daily life. People who never struggled with arithmetic might start to have new trouble with simple arithmetic and managing finances or bills.

What you can do at Stage 4:

At this stage, both patients and caregivers have important, distinct roles. 

If you are a patient, stay consistent with a healthy routine that includes exercise, eating a brain-healthy diet, and practicing social engagement. If you’re interested in drug intervention, speak to your doctor about the two monoclonal antibody drugs, Kisunla and Leqembi, that are FDA-approved. Neither drug stops the progression of Alzheimer’s, but in trials each drug did appear to slow it. 

Speak openly with family about what matters most to you as the disease progresses and make sure you have concrete plans in place about long-term health care and finances. Appoint Power of Attorney and discuss end-of-life preferences while you are still able to participate fully in those conversations.

If you are a caregiver, work with your loved one to establish and uphold predictable daily routines, which can reduce confusion and anxiety for someone living with Alzheimer’s. While you are building the routine, remember to keep your loved one active by scheduling time for a walk outdoor or another form of exercise. If you are struggling to find ways to keep them socially engaged, research your local Alzheimer’s patient groups where they could meet others navigating the same journey. Around the moderate stages, it may become dangerous for your loved one to drive. If they are still driving, have a qualified professional assess their driving ability.

It may become increasingly difficult to communicate, and you’ll likely need to learn new communication strategies that don’t rely as much on verbal cues. What works will change as the disease progresses. Dementia care expert Teepa Snow offers advice on how to best communicate with your loved one. 

While finalizing plans with your loved one about disease progression, speak with a medical professional about long-term care planning, financial assistance options, and end-of-life preferences (including DNR and funeral preferences). In the midst of your demanding role, explore science-backed mindfulness practices that can help you stay patient and grounded.

Stage 5: Moderately severe decline — When does someone need daily help?

Stage 5 marks a significant shift in the level of care required. At this stage, a person with Alzheimer’s can no longer manage independently and needs help with basic daily activities.

Signs that may appear in Stage 5:

At this stage, a person requires help with day-to-day tasks like dressing and sometimes bathing. They will experience trouble with their motor skills and significant disorientation, manifested as confusion about time, place, or situation. They will likely be unable to recall simple personal details, such as their phone number or current address.

What you can do at Stage 5 (caregivers):

As a caregiver during this stage, you may need to find new ways to support your loved one as their own needs increase. Consider investing in a GPS tracking device and home camera system to support their safety. You can also make home modifications like installing grab bars, removing tripping hazards, and labelling drawers for their safety and comfort. Make sure you have a clear plan in place for administering medications and keeping them out of reach of your loved one.

As you navigate this stage, be sure to support your own wellbeing. Build strategies for coping with difficult behaviors and symptoms — including angry or violent outbursts and hallucinations. These are symptoms of the disease, not reflections of the person.

Caregiver burnout is a serious health risk; protecting your own wellbeing is inseparable from the quality of care you provide. More than 90% of caregivers report sleep-deprivation. Joining a dementia support group can be useful to connect with other caregivers.

As the needs of your loved one become more advanced, be sure to explore options for long-term care, including nursing homes and memory care facilities.

Stage 6: Severe decline — What happens in late-stage Alzheimer’s?

Stage 6 represents a profound level of cognitive and physical decline. The person with Alzheimer’s requires full-time assistance and may no longer recognize anyone except close family members.

Signs that may appear in Stage 6:

Stage 6 is marked by severe cognitive changes including the inability to recognize faces, except close friends and relatives. The person with Alzheimer’s may also experience major and uncharacteristic personality changes and behaviors, like anxiety, paranoia, aggression, or depression.

Caregivers will likely need to assist their loved one daily with eating, toileting, and bathing. At this stage, wandering behavior is incredibly common and one in six people living with Alzheimer’s go missing at some point. There are strategies to prevent wandering, like understanding your person’s patterns and triggers and creating a safety plan.

Sundowning behavior, the tendency for people living with dementia to become more confused in the late afternoon and into the night, also becomes more common at this stage.

What you can do at Stage 6 (caregivers):

If you’re looking for new ways to support your loved one and bring them some joy, consider music therapy. Research suggests it can be effective for some people with late-stage Alzheimer’s, helping reduce agitation and improve mood even when verbal communication is limited.

As physical needs increase, make sure you have the appropriate adaptive equipment for bathing, such as a lifting harness, safety bars, and mats.

Caregiving at this stage is one of the most demanding roles a person can take on. Support your wellbeing by leaning on every form of support available — moral and physical. Learn strategies for coping with difficult behaviors, including hallucinations, agitation, and personality changes.

Begin making end-of-life arrangements. This includes identifying palliative care options and ensuring that your loved one’s stated wishes are documented and accessible to the medical team. Palliative care focuses on comfort and quality of life rather than curative treatment, and is appropriate for many people in the final stages of Alzheimer’s disease.

Stage 7: Very severe decline — What is end-stage Alzheimer’s?

Stage 7 is the final stage of Alzheimer’s disease. A person at this stage has experienced comprehensive cognitive decline and requires full assistance with every aspect of daily life.

Signs in Stage 7:

The person with Alzheimer’s can sometimes utter words or phrases, but communication is very limited. They will have no awareness of their own condition and will require help with all activities of daily living. Eating abilities at this stage may be impaired, because the person with Alzheimer’s may lose the ability to swallow. There are strategies to ease swallowing difficulties, and it may be useful to consult with a speech-language pathologist about end-of-life feeding.

What you can do at Stage 7 (caregivers):

At this stage, prioritizing comfort is key. Speak with your loved one’s doctor about medication options to keep them comfortable and minimize distress.

Have clear conversations with the medical team about when aggressive medical intervention is — and is not — appropriate, based on the wishes your loved one expressed earlier.

Support your own wellbeing by taking time to understand what the end stages of the disease look like. Understanding what may come next can help you feel more grounded and make decisions with greater confidence. 

Follow through on any end-of-life, palliative care, or hospice plans you have already made, using them as a guide for care that prioritizes comfort, dignity, and quality of life.

Understanding the seven stages of Alzheimer’s disease won’t change the course of the illness — but it can change the experience of living with it. For patients, knowing what’s ahead creates room for meaningful planning while agency is still intact. For caregivers, it offers a map for a journey that can otherwise feel overwhelming and unpredictable.