What’s the Difference Between Alzheimer’s and Dementia? (And Why It Matters to Know)

Dementia 101

Let’s clear up one of the most common (and confusing!) questions I hear from caregivers:

“What’s the difference between Alzheimer’s and dementia?”

Well, here’s the simple truth:

  • Alzheimer’s is a disease.

  • Dementia is a symptom.

If you’ve ever had a cold, you know it brings a handful of miserable symptoms—like a runny nose, fever, and sore throat. But a cold isn’t a symptom, it’s the cause. The same goes for Alzheimer’s and dementia.

Dementia isn’t a specific disease—it’s the name for a group of symptoms that affect memory, thinking, behavior, and the ability to function. Alzheimer’s is just one of the causes. In fact, there are over 100 different types of dementia.

Let’s take a quick peek at some of the most common types, what causes them, and what they tend to look like:

Type of Dementia Life Expectancy Causes Common Symptoms
Alzheimer’s Disease 9 years avg. Abnormal proteins (plaques & tangles) Memory loss, speech issues, confusion, personality changes, hallucinations
Vascular Dementia 3–5 years avg. Blocked or reduced blood flow Difficulty focusing, balance issues, confusion, memory loss
Lewy Body Dementia 5–7 years avg. Protein deposits in nerve cells Visual hallucinations, REM sleep disorder, rigidity, fainting, word-finding issues
Frontotemporal Dementia 7–13 years avg. Damage to frontal & temporal lobes Personality changes, language issues, mobility problems
Parkinson’s Disease Dementia 10–20 years avg. Dopamine loss in brain Tremors, hallucinations, thinking problems, swallowing issues
Chronic Traumatic Encephalopathy (CTE) N/A Repeated head injuries Mood swings, aggression, memory loss, poor judgment
Creutzfeldt-Jakob Disease 1 year avg. Prion infection Rapid decline, jerky movements, vision issues, insomnia
Alcohol-Related Dementia (Wernicke-Korsakoff) 8 years avg. Brain damage from alcohol & vitamin B1 deficiency Poor focus, judgment, low motivation, apathy

But Wait—There’s More!

Dementia can also show up in people with:

  • Traumatic brain injury

  • HIV

  • Huntington’s Disease

  • Normal Pressure Hydrocephalus

  • Thyroid disorders

  • Vitamin deficiencies

  • Infections (even a UTI can spike symptoms!)

Some of these causes are treatable or reversible, especially if caught early. Others, sadly, are progressive and irreversible—but even then, a proper diagnosis makes all the difference.

Why Is Diagnosis So Important?

Let me paint you a little picture:

“My dad has memory issues.”
“Oh dear, who’s his neurologist?”
“He doesn’t have one.”
“What kind of dementia does he have?”
“Oh… we haven’t really taken him in yet.”

Oh. Wouldn’t you take him to a dentist if he had issues with his teeth, or an orthopedist if he had joint problems? Then don’t wait when it’s his brain.

Here’s why getting diagnosed early is a loving, practical gift for everyone involved:

💜 Helps determine how to pay for care
💜 Provides insight into what behaviors to expect
💜 Guides which treatments or therapies may help
💜 Allows time for legal and financial planning
💜 Lets your loved one share their final wishes while they still can
💜 Gives you a team—doctors, therapists, support networks—to lean on

Not All Dementias Are Created Equal

Some are treatable. Some are not.
Some start with memory loss. Some don’t.
Some come with hallucinations, movement issues, or speech trouble. Some arrive quietly.

And then there’s mixed dementia, which means more than one type is present at the same time. It’s like a brain stew—Alzheimer’s and Lewy bodies and vascular damage, all bubbling in the same pot.

Bottom Line? Know What You’re Dealing With.

If your loved one is having memory, mood, or movement issues—get a professional evaluation.
A neurologist or gerontologist can run the tests and scans to help clarify what’s going on.

And remember: a diagnosis isn’t the end. It’s the beginning of doing what love does best—prepare, protect, and provide care.

💬 Let’s Talk:

Do you remember the moment you got a diagnosis—or when you finally learned what was really going on with your loved one? Share your story in the comments below. Your experience might just help someone else feel a little less alone.