Mild cognitive impairment, or MCI, means memory or thinking has slipped more than is normal for your age. You and the people close to you can notice it. But you can still do most everyday tasks on your own.¹

MCI is not dementia. It is a middle ground between normal aging and dementia. For some people, it is an early sign of Alzheimer's or another brain disease. For others, it stays the same for years or even gets better.^1,2 This page explains what MCI is, what can cause it, and what you can do now.

Key points

MCI is common. About 12% to 18% of people aged 60 and older have it, or roughly 1 in 7.¹
Each year, about 10% to 15% of people with MCI develop dementia. Many others stay stable, and some return to normal.^1,3
Some causes are treatable, such as medicine side effects, depression, sleep apnea, low vitamin B12 or thyroid problems. A full checkup looks for these first.^2,4
No medicine is approved for MCI in general. But if MCI is caused by Alzheimer's and amyloid is confirmed, newer drugs like lecanemab and donanemab may be an option.^2,6,7
Regular exercise is one of the best-supported steps you can take.² Moderate evidence

What MCI looks like

With MCI, the changes are real but mild. A person might lose track of a conversation, forget appointments more often, or need longer to make decisions. They can still shop, cook, pay bills and get around. They may just need more time, notes or reminders.^1,4

Doctors often describe two main kinds:^1,4

Amnestic MCI

Mainly affects memory
Forgetting recent events, conversations or appointments
Repeating questions more than before
More often an early sign of Alzheimer's disease

Nonamnestic MCI

Mainly affects other thinking skills
Trouble planning, making decisions or following the steps of a task
Problems judging distance or seeing how things fit in space
More often linked to Lewy body disease or frontotemporal dementia

How is MCI different from normal aging? Many older adults take longer to recall a name and then remember it later. That is usually normal. In MCI, problems happen more often, are clearly worse than before, and show up on memory tests.^2,4

How is MCI different from dementia? In dementia, thinking problems are bad enough to get in the way of daily life. The person needs help with things like money, medicines or driving.^1,4 In MCI, daily life is mostly still on track. Read more about early-stage dementia and the stages of dementia.

How common it is

MCI becomes more common with age. A review for the American Academy of Neurology (AAN) found it in about 7% of people aged 60 to 64. That rose to about 25%, or 1 in 4, among people aged 80 to 84.²

Many cases are never diagnosed. A study of Medicare data estimated that primary care doctors found only about 8 in 100 of the MCI cases expected in their patients.⁵ That means many people do not get the checkup that could find a treatable cause.

Does MCI turn into dementia?

Not always. MCI can go three ways: it can get worse, stay the same, or get better.^1,4

What can happen	What studies show
Develops into dementia	About 10% to 15% of people with MCI each year.¹ In people over 65, about 15% within two years.²
MCI due to Alzheimer's becomes dementia	About 1 in 3 within five years.¹
Returns to normal thinking	About 18% overall in a large review. About 25% in community studies, but only about 8% in memory clinic patients.³

Why the numbers differ. Getting better was about three times as common in people found through community studies as in people already seen at memory clinics.³ Clinic patients may be further along. That is also why it matters to look for causes that can pass, like a medicine side effect or poor sleep.^2,4

Getting better does not always mean all clear. People whose MCI goes away still have a higher chance of problems later than people who never had MCI.^2,3 That is why doctors suggest checking again over time. The Alzheimer's Association suggests a recheck about every six months.¹

What causes MCI

MCI is a description of symptoms, not one disease. Many different things can cause it.⁴

Early brain disease. Many cases, but not all, come from early changes of Alzheimer's disease or another condition that slowly damages the brain.¹ These include Alzheimer's disease, Lewy body dementia, Parkinson's disease and frontotemporal dementia.⁴

Blood vessel problems. High blood pressure, high cholesterol, heart disease and strokes, including very small ones, are linked to MCI.⁴ See vascular dementia.

Treatable or reversible causes. These are important to find, because fixing them can help thinking improve:^2,4

Medicines. Sleeping pills, anxiety pills such as benzodiazepines, opioid pain pills, muscle relaxants, some seizure medicines and anticholinergics (drugs that block a brain chemical called acetylcholine, such as some allergy and bladder medicines). See medicines that can worsen memory.
Depression and anxiety. Low mood can make it hard to focus and remember. See depression in later life.
Sleep apnea, when breathing stops and starts during sleep. See sleep apnea.
Low vitamin B12, low thyroid, blood sugar swings, dehydration or an infection such as a urinary tract infection.
Normal pressure hydrocephalus, a buildup of fluid in the brain that can sometimes be treated. See normal pressure hydrocephalus.

Risk factors you cannot change. Older age is the strongest. Family history and a gene form called APOE e4 also raise the risk.^1,4 See genes and dementia.

How MCI is diagnosed

There is no single test for MCI. A doctor decides based on the whole picture.¹ A good checkup usually includes:^1,2,4

Your story and a family member's view. The doctor asks what has changed and since when. Someone who knows you well can describe changes you may not notice.
A daily-life check. Questions about managing money, medicines, driving and household tasks.
A full medicine review, including over-the-counter pills and supplements.
Short memory and thinking tests, such as the MoCA or Mini-Cog. See memory and thinking tests.
A mood check for depression and anxiety.
A physical and nerve exam, plus blood tests for B12, thyroid and other causes.
Often a brain scan (MRI or CT) to look for strokes, tumors or fluid buildup. See brain scans.

If the picture is still unclear, the doctor may suggest longer testing with a neuropsychologist (a specialist in thinking tests).¹

Tests for Alzheimer's proteins. If the doctor thinks Alzheimer's may be the cause, an amyloid PET scan or spinal fluid test can show whether amyloid (a sticky protein that builds up between brain cells) is present. When it is, the diagnosis is called MCI due to Alzheimer's disease.¹ In May 2025, the FDA cleared the first blood test that helps show whether amyloid is likely present. It is for adults 55 and older with memory symptoms seen in specialty care. It is not a screening test and is not used alone.¹¹ See blood tests for Alzheimer's and spinal fluid tests.

Medicare can help. Medicare's yearly Wellness Visit includes a check for signs of memory problems, and you usually pay nothing if your provider accepts assignment.⁹ If a problem is suspected, Part B also covers a separate, longer visit to assess thinking, confirm a diagnosis and make a care plan. You usually pay 20% after the deductible for that visit.¹⁰ See the first doctor visit about memory.

What you can do now

Treat what can be treated. Ask your doctor to look for every reversible cause. If a medicine may be part of the problem, ask whether it can be changed. Never stop or change a medicine on your own. Talk with your doctor or pharmacist first.²

Move your body. The AAN guideline says regular exercise, about twice a week for six months, likely helps thinking in people with MCI.² Walking, strength training and balance classes all count. See exercise for brain health.

Keep your mind and social life active. Cognitive training, such as structured memory and thinking exercises, may help a little. The evidence is weaker than for exercise.² See staying mentally and socially active.

Protect your heart and blood vessels. Keep blood pressure, cholesterol and diabetes under control. Avoid tobacco and limit alcohol.⁴ See blood pressure and the brain.

Check hearing, vision and sleep. Get hearing and vision checked, and treat sleep problems.⁴ See hearing, vision and brain health and sleep in later life.

Use simple memory aids. A calendar, pill organizer, phone reminders and a notebook can make daily life easier. Try our memory notebook.

Plan ahead while it is easier. Now is a good time to name a trusted person to make health and money decisions if you ever cannot.^2,4 See power of attorney and advance directives. Talk about driving and protect yourself from scams.⁴

Regular exercise

Moderate evidence

The AAN guideline says exercise about twice a week for six months likely helps thinking in people with MCI.²

Treating reversible causes

Strong evidence · guideline

Finding and treating causes like medicine side effects, depression or sleep apnea is standard care, and it can help thinking improve.^2,4

Cognitive training

Promising

Structured memory and thinking exercises may help a little. The evidence is weaker than for exercise.²

Memory medicines and supplements

Limited research

No medicine or supplement has good proof of helping MCI in general.^2,4 See supplements and memory claims.

Medicines and the new Alzheimer's treatments

Older memory medicines. No drug is approved by the FDA for MCI in general.^2,4 Donepezil and similar drugs (cholinesterase inhibitors) are approved for Alzheimer's dementia. The AAN found no good evidence they help MCI, and doctors may choose not to prescribe them. If a doctor does offer one for MCI, they should first explain that this is an off-label use without proof it works.² See donepezil, rivastigmine and galantamine.

Anti-amyloid drugs. Lecanemab (Leqembi) and donanemab (Kisunla) remove amyloid from the brain. They are approved for Alzheimer's disease, to be started at the MCI or mild dementia stage.^6,7 As of October 2026, a person usually needs all of these to be considered:^6,7,8

MCI or mild dementia caused by Alzheimer's, not by another condition
Amyloid confirmed by a PET scan, spinal fluid test or another approved test
A recent brain MRI before starting, and willingness to have more MRIs during treatment
For Medicare Part B to pay, a doctor who enters data into an approved study or registry

These drugs are not meant for MCI from other causes, such as strokes, depression or medicines. In the main lecanemab study, people with early Alzheimer's still declined, but about 27% more slowly over 18 months. That was a 0.45-point difference on an 18-point scale, which is small.⁶ Donanemab also slowed decline in its main trial.⁷

The main risk is ARIA, which is brain swelling or small bleeds. It is usually found only on MRI, but it can rarely be serious or deadly.^6,7 People with two copies of the APOE e4 gene have the highest risk, so the FDA recommends a gene test before starting.^6,7 People who take blood thinners also need extra caution.⁶ Read are anti-amyloid treatments right for us?, lecanemab, donanemab, ARIA and paying for new Alzheimer's drugs.

Research studies. People with MCI are often needed for research. See joining a dementia clinical trial and new treatments being tested.

Living with the news

Hearing "MCI" can bring worry, relief or both. Some people are glad to have a name for what they noticed. Others fear what comes next. Both are normal. Remember that many people with MCI do not get dementia, and some get better.^1,3

Family members can help by going to visits, taking notes and keeping an eye on changes over time. Try not to quiz or correct the person. Simple supports work better than pressure. The Alzheimer's Association 24/7 Helpline at 800-272-3900 can answer questions and point you to support groups.¹ See also caregivers and keeping your brain healthy.

When to get help

See a doctor if you or others notice memory or thinking changes that are new, happening more often or getting worse.¹
Get a recheck sooner if daily tasks such as bills, medicines or driving start to slip. That may be a sign of dementia, and the plan may need to change.
Get urgent care the same day if thinking gets much worse over days or a few weeks. Sudden confusion can be delirium from an infection or medicine. See dementia that gets worse fast.

Call 911 for sudden confusion with weakness on one side, a drooping face, trouble speaking, a seizure, or a sudden severe headache. These can be signs of a stroke or, for people on anti-amyloid drugs, serious ARIA.⁶

If worry about memory leaves you feeling hopeless or thinking about ending your life, call or text 988 to reach the 988 Suicide and Crisis Lifeline any time.

Sources

Alzheimer's Association. Mild cognitive impairment (MCI). Alzheimer's Association, 2026. alz.org
Petersen RC, et al. Practice guideline update summary: mild cognitive impairment. Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology. Neurology, 2018. PMC
Canevelli M, et al. Spontaneous reversion of clinical conditions measuring the risk profile of the individual: from frailty to mild cognitive impairment. Front Med, 2017. Frontiers
Anand S, Schoo C. Mild cognitive impairment. StatPearls, NCBI Bookshelf, updated 2024. NCBI
Liu Y, et al. Detection rates of mild cognitive impairment in primary care for the United States Medicare population. J Prev Alzheimers Dis, 2024. PMC
U.S. Food and Drug Administration. LEQEMBI and LEQEMBI IQLIK (lecanemab-irmb) prescribing information, revised July 2026. FDA, 2026. FDA label
U.S. Food and Drug Administration. FDA approves treatment for adults with Alzheimer's disease (Kisunla). FDA, 2024. FDA
Medicare.gov. Monoclonal antibodies for treating early Alzheimer's disease. Centers for Medicare & Medicaid Services, 2026. Medicare.gov
Medicare.gov. Yearly "Wellness" visits. Centers for Medicare & Medicaid Services, 2026. Medicare.gov
Medicare.gov. Cognitive assessment and care plan services. Centers for Medicare & Medicaid Services, 2026. Medicare.gov
U.S. Food and Drug Administration. FDA clears first blood test used in diagnosing Alzheimer's disease. FDA, 2025. FDA

Education only. This page is general information written from the sources listed. It is not medical, legal or financial advice and does not replace a doctor, therapist or lawyer who knows your situation. How we write and check pages.

Mild cognitive impairment (MCI)