Your father still pays his bills and drives to the store, but lately he's missed two doctor's appointments and asked you the same question twice in one call. He laughs it off. You aren't sure whether to worry. That in-between place is exactly where mild cognitive impairment lives.
This guide draws on the Alzheimer's Association, the National Institute on Aging and Medicare. It's general information, not medical advice. A clinician has to do the evaluation.
What mild cognitive impairment is
The Alzheimer's Association defines MCI as an early stage of memory loss or loss of other thinking abilities, such as language or visual and spatial perception, in people who can still independently handle most activities of daily living1. The changes are serious enough for the person and their family and friends to notice, but they don't stop the person from carrying out everyday activities1.
That last part is the key difference from dementia. Dementia means thinking problems are serious enough to get in the way of daily life2. With MCI, your parent may need more reminders, lists and effort, but they are still running their own day. See Alzheimer's vs. dementia for how the bigger terms fit together. Some newer drugs are for early stages; see Alzheimer's medications.
Two kinds of MCI
Experts group MCI by which thinking skills are affected1:
- Amnestic MCI. Mainly affects memory. A person starts forgetting things they would once have recalled easily, such as appointments, conversations or recent events1.
- Nonamnestic MCI. Affects other thinking skills, such as making sound decisions, judging the time or steps a complex task needs, or visual perception1.
Families often notice the second kind as "Dad just isn't himself": a new trouble following a recipe, planning a trip or keeping track of a checkbook, even though his memory seems fine.
MCI vs. normal aging
Some change is normal with age. The National Institute on Aging notes that older adults may take longer to learn new things or occasionally misplace items or forget a name3. The difference with MCI is a decline from the person's own usual level that others notice1.
| Normal aging | MCI | Dementia | |
|---|---|---|---|
| Memory and thinking | Occasional slips, slower recall | More frequent problems others notice | Problems that disrupt daily life |
| Daily activities | Unaffected | Mostly independent, with more effort | Needs help |
| Course | Stable | May stay stable, improve or progress | Usually progresses |
Sources: Alzheimer's Association; National Institute on Aging.
Does MCI turn into dementia?
Sometimes, but not always. The Alzheimer's Association says some people with MCI go on to develop dementia and others don't1. In some people, MCI returns to normal thinking or stays stable1. And sometimes what looked like MCI was really caused by something else, such as a medicine1.
For a sense of scale, the Association's 2022 special report estimated that roughly 12 to 18 percent of people 60 and older live with MCI, and that about 10 to 15 percent of people with MCI develop dementia each year1. Those are averages across many people. They can't predict what will happen to your parent.
When MCI is caused by the early brain changes of Alzheimer's, doctors may call it "MCI due to Alzheimer's disease," which can be identified with tests for amyloid such as a PET scan or spinal fluid test1.
Causes and risk factors
The causes of MCI aren't fully understood1. Many cases, but not all, come from very early changes of Alzheimer's or other diseases that cause dementia1. When the cause is one of those diseases, the risk factors most strongly linked to MCI are older age, a family history of Alzheimer's or another dementia, and conditions that raise the risk of heart and blood vessel disease1.
Other causes can be treated. Depression is common in older adults and can cause memory problems or a "foggy" feeling1. Medication side effects, sleep problems, hearing loss and thyroid or vitamin problems are also worth asking about4. See depression in older adults and hearing loss in the elderly.
How MCI is diagnosed
MCI is a clinical diagnosis, meaning it reflects the doctor's best judgment about the reason for the symptoms1. A typical workup includes1:
- A medical history. Current symptoms, past illnesses and any family history of memory problems.
- A look at daily function. Changes from your parent's usual level.
- Input from family. A relative or trusted friend describes what has changed. This is where your notes help most.
- Brief thinking tests. Memory, planning, judgment and visual skills.
- A neurological exam. Reflexes, movement, balance and senses.
- A mood check. To look for depression.
- Lab tests and brain imaging. To look for other causes.
If the picture is still unclear, the doctor may suggest neuropsychological testing, a longer set of written or computer tests1. Medicare Part B covers a separate visit to review thinking, confirm a diagnosis and build a care plan, and a family member can come along5. A screen can also be part of the Annual Wellness Visit5.
Questions to ask the doctor
- What do you think is causing this? Ask whether the doctor suspects Alzheimer's, vascular changes, a medicine, mood or something else.
- Which of these causes can be treated? And what the plan is for each.
- Should my parent see a specialist? Such as a neurologist, geriatrician or neuropsychologist.
- Is my parent a candidate for newer Alzheimer's treatments? And what testing that would take1.
- Is it safe to keep driving, cooking and managing money? Ask what to watch for.
- When is the next recheck? Put it on the calendar before you leave1.
Write the answers down, or ask whether you can record the conversation on your phone.
Treatment and what helps
There's no single pill for MCI itself. Treatment starts with whatever is causing it. If a medicine is the problem, changing it may help. If depression is part of it, treating the depression may sharpen thinking.
When MCI is due to Alzheimer's, two drugs, lecanemab and donanemab, have full FDA approval for early Alzheimer's disease, which includes MCI due to Alzheimer's, and they slow decline in some people1. They aren't right for everyone, and eligibility requires testing. Ask a specialist whether your parent should be evaluated.
Day-to-day habits that support brain and heart health also make sense: physical activity, managing blood pressure and diabetes, staying socially connected and getting enough sleep. See loneliness in the elderly for why connection matters. Whatever the cause, the Alzheimer's Association recommends a recheck every six months to see whether symptoms have changed1.
Plan while your parent can lead
This may be the most valuable thing families can do with an MCI diagnosis. Your parent can still make and explain their own choices, and documents signed now are less likely to be questioned later6.
- Name decision-makers. A durable financial power of attorney and a health care agent. See power of attorney for an elderly parent.
- Write down care wishes. An advance directive covers medical choices. See advance directive vs. living will.
- Organize money. Set up automatic payments, consolidate accounts and agree on who can see statements. See managing a parent's finances.
- Talk about where they'd want to live. If help is needed someday, would they choose home care, a move near family or a community?
- Watch for scams. People with thinking changes are common targets. See elder financial abuse.
Everyday supports that help
- One calendar. A large wall calendar or a shared phone calendar for appointments.
- Pill organizers or blister packs. Ask the pharmacy. See medication management for more ideas.
- A spot for keys and glasses. Same place, every time.
- Notes, not quizzes. Avoid testing your parent ("Do you remember what I told you?"). It adds stress without helping.
- Driving check-ins. MCI doesn't automatically end driving, but watch for new problems. See when to stop driving.
Keep your own notes on what you see and when. They make each six-month recheck more useful.
Talking about it without fear
An MCI diagnosis can be scary. It may help to frame it as information, not a verdict: the doctor found changes worth tracking, some causes are treatable, and many people stay stable. Ask your parent what they want to know and who they want told. Respect their pace, but keep planning on the table. And look after yourself too: worry about a parent's future is draining, and it helps to have someone to talk to.
If your parent resists the evaluation, it may help to suggest a general checkup or to tie it to something they care about, like keeping their license. See when a parent refuses help.
An example
Rosa, 72, kept losing track of her online bill payments. Her daughter came to a cognitive assessment visit with a list of examples. The doctor found mild depression and a sleep medicine that can affect thinking, and diagnosed amnestic MCI. Rosa switched medicines, started counseling and joined a walking group. At her six-month recheck, her scores were about the same. She used the time to sign a power of attorney and set up automatic payments. This is an illustration; each person's course is different.
Next steps
Book the evaluation, bring your notes and every medicine, and ask for a written care plan. If your parent later needs more help, our memory care guide and the care quiz can help you sort out options. The Alzheimer's Association's 24/7 Helpline is free for questions along the way9.
