Dementia: how is it different from forgetfulness, and when should you get checked?

What is dementia?

Dementia is a decline in brain function in which memory, judgment, language, and other abilities worsen so much that living independently becomes difficult. It is not a single disease but a group of symptoms with many causes; Alzheimer's disease and vascular dementia are the most common.

Not everyone develops dementia with age. Dementia is not normal aging but a condition that needs treatment and care.

Forgetfulness vs. dementia

• Forgetfulness: you forget where you were meeting someone, but a hint brings it back — "Oh, right!" You know you forgot.
• Dementia: you don't remember making the appointment at all, and hints don't help. The person often isn't aware of the memory loss.
• Forgetfulness doesn't seriously affect daily life, while dementia gradually worsens and makes daily life harder.

Get checked if you notice these changes

• Repeating a story or question just asked
• Getting lost on familiar routes or often mixing up the date or day
• Struggling with familiar tasks such as handling money, cooking, or using appliances
• Trouble finding words, making conversation difficult
• Losing things and suspecting others of taking them
• Personality changes, loss of motivation, withdrawing from people

Depression, thyroid problems, vitamin deficiencies, and medication side effects can cause similar symptoms — and these improve with treatment. That is why getting evaluated matters more than judging for yourself.

Where to get evaluated

Start with a primary care doctor, who can do a short memory screening and check for treatable causes. If needed, they will refer you to a neurologist, geriatric psychiatrist, or memory clinic.

• U.S.: Medicare's Annual Wellness Visit includes a check for cognitive changes.
• U.S.: the Alzheimer's Association 24/7 Helpline (1-800-272-3900) offers free advice on memory concerns and caregiving, with interpreters available.
• U.S.: the Eldercare Locator (1-800-677-1116) connects you to local services for older adults and caregivers.
• Korea: people aged 60 and over can get free dementia screening at dementia relief centers inside public health centers; the dementia hotline is 1899-9988 (24/7).

You can find memory clinics and centers on the map with this site's "Find help" page.

What family members can do

• Instead of blaming ("You keep forgetting things"), suggest it gently: "Let's both get a checkup."
• Go to the appointment together and tell the doctor what has changed. The person often doesn't notice the changes.
• After a diagnosis, don't carry it alone — look into caregiver support groups, adult day programs, and long-term care options.

Habits that lower the risk

• Regular exercise, such as walking three or more times a week
• Managing blood pressure, blood sugar, and cholesterol
• Not smoking and drinking less
• Staying social and learning new things
• Using hearing aids if you have hearing loss — it is also a risk factor
• Getting enough sleep and treating depression