Learning
What is dementia?
Dementia is an umbrella term for a decline in memory, thinking, or behavior serious enough to interfere with daily life. It is not a normal part of aging.
Updated 2026-02-15
It's a syndrome, not a disease
"Dementia" describes a set of symptoms — losing track of words, getting lost in familiar places, missing appointments, struggling with money. Several different diseases can cause those symptoms, and the cause matters because each one progresses differently and may respond to different medications.
The most common causes
- Alzheimer's disease — about 60–70% of cases. Memory loss is usually the earliest sign.
- Vascular dementia — caused by small strokes. Often stair-step progression.
- Lewy body dementia — visual hallucinations, sleep disturbance, and Parkinson-like stiffness early on.
- Frontotemporal dementia — personality, judgement, or language changes before memory.
- Mixed dementia — most older brains show more than one cause.
What dementia is NOT
- Normal aging. Forgetting names is common; forgetting how to use a fork is not.
- Depression — but depression in older adults can look like dementia and is treatable.
- Medication side effects — anticholinergics, benzodiazepines, opioids can all mimic dementia.
- Thyroid, B12, or urinary tract infection — any of these can cause confusion overnight.
The first 30 days after a diagnosis
- Confirm the type — ask the doctor which form of dementia they suspect, and on what evidence.
- Power of attorney while your loved one can still sign. Don't wait.
- Update advance directives — healthcare proxy, living will, POLST.
- Audit medications with a pharmacist — many older adults take meds that worsen confusion.
- Check eligibility for the Medicare GUIDE program — a navigator, 24/7 helpline, and up to $2,500/year of respite at no cost.
Frequently asked questions
- Is forgetting names a sign of dementia?
- Occasionally forgetting a name and remembering it later is normal. Forgetting common words or losing track of conversations regularly is worth a doctor's appointment.
- Can dementia be reversed?
- Some causes — vitamin deficiency, thyroid disease, medication side effects, depression, normal-pressure hydrocephalus — can be reversed or substantially improved. Alzheimer's and most other neurodegenerative dementias cannot be reversed but can be slowed and managed.
- How long does dementia last?
- Average life expectancy from diagnosis is 8–10 years for Alzheimer's, but ranges widely. Lewy body and frontotemporal forms often progress faster.
Every dementia journey is different.
Memory Lane Care helps you understand what applies to your loved one, what to expect next, and which resources fit your family's situation.
Related across the journey
Memory Lane connects every part of dementia care. Here's how this topic threads into the rest.
Behavior Guidance
Hard Conversations
GUIDE
Resources
Treatments
Keep reading
Learning
The stages of dementia
Dementia is progressive — symptoms worsen over time — but the path is never identical between people. Knowing the stages helps you plan, not predict.
Learning
Alzheimer's vs dementia — what's the difference?
Dementia describes the symptoms. Alzheimer's is one specific disease that causes them — the most common one, but not the only one.
Behavior Guidance
Sundowning — why afternoons get hard, and what helps
Sundowning is the cluster of agitation, restlessness, confusion or anxiety that often shows up in late afternoon and early evening. It's exhausting — and it's manageable.
Hard Conversations
When it's time to stop driving
Driving is identity, freedom, dignity. It is also two tons of metal at 50 mph. Most dementia families do not get this conversation right the first time, and that's OK.
GUIDE
Am I eligible for Medicare GUIDE?
GUIDE (Guiding an Improved Dementia Experience) is a Medicare program launched in 2024 that gives families a care navigator, 24/7 helpline, caregiver training, and up to $2,500/year in respite — all at no copay.
Learning
Lewy body dementia
Lewy body dementia (LBD) is the third most common dementia. It shows up differently — visual hallucinations, sleep behaviors, Parkinson-like stiffness — and is dangerous to treat with the wrong medications.
Learning
Caregiver burnout: the warning signs
Burnout is not a feeling — it's a physiological state. Catching it early lets you act before you (or your loved one) gets hurt.
Paying for Care
SSDI for dementia
If your loved one was diagnosed before 65 and was still working, Social Security Disability Insurance (SSDI) can replace income within weeks, not years.