Is Forgetfulness Always a Sign of Dementia?
You walk into the kitchen and forget why. You can't find your glasses (they're on your head). You blank on a neighbour’s name. Then a scarier thought shows up: Is this the start of dementia?
The short answer is no, not necessarily. Forgetting things now and then is common, and it's often a normal part of aging. But memory problems that keep getting worse, or start getting in the way of daily life, deserve a closer look.
This post covers how to tell the difference, what else can cause forgetfulness, and what you can start doing this week.
Normal Forgetfulness vs. Early Signs of Dementia
The National Institute on Aging (NIA, 2023) says that taking longer to learn something new, misplacing things, or forgetting to pay a bill now and then are usually signs of mild forgetfulness, not a serious memory problem. Serious memory problems make everyday things hard, like driving, using the phone, or finding your way home.
Here is how the two often look different (NIA, 2023):
Usually normal:
Making a bad decision once in a while
Forgetting what day it is, then remembering
Missing a monthly payment
Sometimes blanking on a word
Losing things from time to time
Worth checking:
Making poor decisions much of the time
Trouble keeping up with monthly bills
Losing track of the date or time of year
Trouble having a conversation
Misplacing things often and not being able to find them
It's time to talk with a doctor if you notice things like:
Asking the same question again and again
Getting lost in places you know well
Trouble following recipes or directions
Growing confusion about time, people, or places
Not taking care of yourself, or behaving in unsafe ways
One more thing worth knowing. Dementia means memory and thinking problems that get serious enough to interfere with daily life. It is not just memory loss, and it is not a normal part of aging. It can also affect language, attention, and judgment, and some people notice changes in personality.
What Else Can Cause Forgetfulness Besides Dementia?
The good news is that many causes of forgetfulness can be treated. The NIA (2023) lists several things that can affect memory:
Poor sleep
Depression and anxiety
Side effects from medicines
Low vitamin B12
Thyroid, kidney, or liver problems
Alcohol or drug misuse
A head injury, such as a concussion
Memory problems from conditions like these often improve once the cause is treated, though how much they improve varies from person to person. That's why it's worth finding the cause before assuming the worst.
Stress counts too. Big life changes, like retiring or losing someone you love, can leave you forgetful. That kind of forgetfulness is usually temporary, but if it lasts more than a few weeks, talk with your doctor.
Stress can also affect attention and memory. To learn more about this connection, read our article, How Chronic Stress Affects Your Brain and What You Can Do About It.
The In-Between Stage: Mild Cognitive Impairment
Some people have more memory or thinking problems than others their age, but they can still take care of themselves and do their normal activities. Doctors call this mild cognitive impairment, or MCI. Signs can include losing things often, forgetting events or appointments, and having more trouble finding words (NIA, 2021).
MCI can be an early sign of Alzheimer's disease or another dementia, but it doesn't always lead there. Symptoms may stay the same, or even get better over time (NIA, 2021). In one 2025 review, about 3 in 10 people diagnosed with MCI were later tested and found to have normal conditions at a later date (Zhao et al., 2025). Results varied a lot, and fewer people returned to normal in clinic-based studies than in community studies (Malek-Ahmadi, 2016). Some people who return to normal can also decline again later, so follow-up still matters (Zhao et al., 2025).
Because MCI can be an early warning sign, it's important to see a doctor or specialist every 6 to 12 months so changes can be tracked over time (NIA, 2021).
What Can You Do About Memory Problems?
You can't control everything about your memory, but you can do a lot. Here's where to start. Most of these tips come from the NIA (2023) and a major 2024 international report on dementia prevention (Livingston et al., 2024).
If you're forgetting things day to day:
Give things a home. Keep your keys, wallet, phone, and glasses in the same place every day.
Write it down. Use calendars, notes, and to-do lists, and stick to a daily routine. Phone reminders can help too. Try a five-minute brain dump: write down everything on your mind, then sort it into "calendar," "to-do," and "let go."
Sleep matters too. Poor sleep can affect memory, and seven to eight hours a night is the usual advice.
For more information about how sleep and rest support cognitive functioning, read our article, The Role of Rest in Brain Healing.
If you're worried it's more than normal:
Keep a simple memory log. Jot down what you forgot, when, how often, and what was going on (poor sleep, stress, a new medicine). Bring it to your appointment (NIA, 2021).
Ask your doctor to check the basics. Sleep, mood, medicines, vitamin B12, and thyroid problems can all affect memory. Never stop taking medicine on your own. Ask for a review instead.
Get your hearing and vision checked. Hearing loss and untreated vision loss are both linked to higher dementia risk, and treating hearing loss, for example with hearing aids, may lower that risk (Livingston et al., 2024).
Bring someone with you. Family and friends may notice changes you don't. People who are worried about their memory often rate their abilities lower than their family does, while people with more advanced changes often rate them higher. A second view helps (NIA, 2021; Coddaire et al., 2025).
Look after your brain for the long run:
Build the habits that protect it. The 2024 report identified 14 risk factors for dementia that may be changeable, including high blood pressure, hearing loss, physical inactivity, depression, and social isolation. Addressing them may help prevent or delay dementia, but it's not a guarantee for any one person, and no lifestyle approach is proven to prevent Alzheimer's disease. Staying active, keeping blood pressure in check, and spending time with people are good places to start (Livingston et al., 2024; NIA, 2023).
Be careful with supplements and brain-training games that promise to prevent memory loss. They may be unsafe or a waste of money, so check with your doctor first (NIA, 2023).
When Should You See a Doctor About Memory Problems?
Book an appointment if the changes are noticeable, last more than a few weeks, or are getting worse. The same goes if you notice the signs listed earlier, like getting lost in familiar places or asking the same question again and again. A doctor can do tests and assessments to find the cause, and may suggest a specialist (NIA, 2023). Bring your memory log and, if you can, someone who knows you well.
One important exception: if confusion comes on suddenly, don't wait for a regular appointment. Sudden confusion can have causes like an infection, a stroke, a head injury, or a reaction to medicine, and it needs medical help right away (National Health Service [NHS], 2024). Call 911 or go to the nearest emergency department.
Memory testing works alongside a medical check-up with your doctor, not instead of it. If you'd like a closer look, our team offers detailed memory and thinking testing through our Cognitive Health & Aging service to help sort out what's going on and what to do next. Not sure whether what you're noticing is normal? That's exactly what a conversation is for. Reach out to our team and we'll help you figure out the right next step.
The Takeaway
Forgetting isn't always dementia. Most forgetfulness is normal, or has a cause that can be treated. The things to watch for are changes that keep getting worse, keep happening, or get in the way of daily life. Start with small habits you can use today, check the basics with your doctor, and don't wait if something feels different. Finding the cause is the first step toward the right plan.
This article is for general educational purposes and isn't a substitute for individualized medical or psychological advice.
References
Coddaire, K., McElvogue, M., Stokes, A. M., & Prigatano, G. P. (2025). Neuropsychological correlates of reduced self-awareness of functional competency in persons with subjective memory complaints, mild cognitive impairment, and early probable Alzheimer's dementia. Frontiers in Neurology, 16, Article 1666039. https://doi.org/10.3389/fneur.2025.1666039
Livingston, G., Huntley, J., Liu, K. Y., Costafreda, S. G., Selbæk, G., Alladi, S., Ames, D., Banerjee, S., Burns, A., Brayne, C., Fox, N. C., Ferri, C. P., Gitlin, L. N., Howard, R., Kales, H. C., Kivimäki, M., Larson, E. B., Nakasujja, N., Rockwood, K., . . . Mukadam, N. (2024). Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. The Lancet, 404(10452), 572–628. https://doi.org/10.1016/S0140-6736(24)01296-0
Malek-Ahmadi, M. (2016). Reversion from mild cognitive impairment to normal cognition: A meta-analysis. Alzheimer Disease & Associated Disorders, 30(4), 324–330. https://doi.org/10.1097/WAD.0000000000000145
National Health Service. (2024, May 28). Sudden confusion (delirium). https://www.nhs.uk/symptoms/confusion/
National Institute on Aging. (2021, April 12). What is mild cognitive impairment? https://www.nia.nih.gov/health/memory-loss-and-forgetfulness/what-mild-cognitive-impairment
National Institute on Aging. (2023, November 22). Memory problems, forgetfulness, and aging. https://www.nia.nih.gov/health/memory-loss-and-forgetfulness/memory-problems-forgetfulness-and-aging
Singh, B., Bennett, H., Miatke, A., Dumuid, D., Curtis, R., Ferguson, T., Brinsley, J., Szeto, K., Petersen, J. M., Gough, C., Eglitis, E., Simpson, C. E. M., Ekegren, C. L., Smith, A. E., Erickson, K. I., & Maher, C. (2025). Effectiveness of exercise for improving cognition, memory and executive function: A systematic umbrella review and meta-meta-analysis. British Journal of Sports Medicine, 59(12), 866–876. https://doi.org/10.1136/bjsports-2024-108589
Zhao, Y., Wei, S., Liu, Y., He, X., Li, J., Gao, T., Wang, X., Li, Y., Nan, J., Wang, Y., & Ma, Y. (2025). The prevalence and influencing factors of reversion from mild cognitive impairment to normal cognition: A systemic review and meta-analysis. Geriatric Nursing, 63, 379–387. https://doi.org/10.1016/j.gerinurse.2025.03.013
