Your dad's memory actually seems pretty good. He still knows everyone's birthday. But lately he's been seeing people in the living room who aren't there, and some days he seems sharp while other days he's foggy and hard to reach.
Or maybe it's your mom, who has become someone you barely recognize. She says blunt, hurtful things she never would have said before. She's spending money impulsively. Her memory for appointments is fine, so nobody is taking it seriously.
Many families assume that dementia means memory loss, and that memory loss means Alzheimer's disease. Sometimes that's true. But dementia comes in several forms, and they don't all start with forgetting.
First, What Is Dementia?
Dementia isn't one disease. It's an umbrella term for a decline in thinking skills that is significant enough to interfere with daily life, such as managing money, medications, driving, or household tasks.
Many different conditions can cause dementia. Each affects the brain in its own way, which is why early signs can look so different from person to person.
Alzheimer's Disease
Alzheimer's disease is the most common cause of dementia, and it is what most people picture when they hear the word.
Typical early signs: Trouble remembering recent conversations and events, asking the same questions repeatedly, and relying more and more on notes and reminders.
The memory pattern: New information doesn't "stick," even with cues or reminders. This is different from the slower recall that comes with normal aging.
How it progresses: Gradually, over years. Over time, it affects language, judgment, navigation, and daily functioning.
Vascular Dementia
Vascular dementia is caused by reduced blood flow to the brain, from strokes (sometimes small ones that go unnoticed) or long-term damage to small blood vessels.
Typical early signs: Slowed thinking, trouble with planning and organizing, difficulty following multi-step tasks, and problems with attention. Memory may be less affected early on.
Other clues: A history of stroke, high blood pressure, diabetes, or heart disease. Changes in walking or balance can also show up.
How it progresses: Sometimes in noticeable "steps," with a decline after a new stroke followed by a period of stability. It can also progress gradually.
Dementia With Lewy Bodies
Lewy body dementia is often missed or mistaken for Alzheimer's or Parkinson's disease, even though it has a distinctive pattern.
Typical early signs: Thinking and alertness that fluctuate noticeably from day to day or even hour to hour, detailed visual hallucinations, and trouble with attention and visual-spatial skills (like judging distances).
Other clues: Acting out dreams during sleep (shouting, kicking, or punching while asleep), stiffness, slowed movement, a shuffling walk, or falls.
Why an accurate diagnosis matters: People with Lewy body dementia can be very sensitive to certain medications, including some antipsychotics. Knowing the diagnosis helps their medical team choose treatments safely.
Frontotemporal Dementia
Frontotemporal dementia (FTD) affects the front and side areas of the brain, which control personality, behavior, judgment, and language. It often begins at a younger age than other dementias, frequently before 65.
Behavior-focused form: Personality changes, loss of empathy, socially inappropriate behavior, apathy, impulsive spending or eating, and new rigid routines. Memory may seem normal at first.
Language-focused forms: Gradually losing the ability to find words, speak fluently, or understand the meaning of words.
Why it's often missed: Because it can start in midlife and look like a personality or mood change, FTD is frequently mistaken for depression, a midlife crisis, or a psychiatric condition. Families sometimes spend years searching for answers.
Mixed Dementia
It's common, especially in older adults, for more than one process to be happening at once. Alzheimer's disease and vascular changes often occur together, for example. This can complicate the picture and is one reason a careful evaluation matters.
Not Every Memory Change Is Dementia
Some causes of thinking problems are treatable or reversible. These include depression, medication side effects, sleep problems such as sleep apnea, thyroid problems, vitamin B12 deficiency, and certain other medical conditions. That is why a full workup, including a visit with a primary care provider, matters before anyone settles on a diagnosis. (I explain one of the most common mix-ups in Dementia vs. Depression in Older Adults.)
Some people also have mild cognitive impairment, where changes are noticeable but not severe enough to be considered dementia.
How a Neuropsychological Evaluation Helps
A brief memory screening can show that something is wrong. It usually can't show what kind of problem it is. (More on that in When a Memory Screening Isn't Enough.)
A neuropsychological evaluation looks closely at memory, attention, language, processing speed, visual-spatial skills, reasoning, and mood. The pattern of strengths and weaknesses helps point toward the underlying cause. For example:
Difficulty holding on to new information, even with cues, is more typical of Alzheimer's disease.
Slowed thinking and trouble with planning, with memory that improves with cues, can point toward vascular changes.
Marked problems with attention and visual-spatial skills can suggest Lewy body disease.
Changes in judgment, behavior, or language with relatively intact memory can suggest frontotemporal dementia.
These results work alongside your loved one's medical care, including input from their primary care provider, neurologist, and brain imaging. Together, they give families a clearer answer and a baseline to compare against in the future.
A diagnosis can also guide treatment decisions, safety planning, and caregiver support. I wrote about why this matters, even without a cure, in Why a Diagnosis Matters, Even When There's No Cure.
Memory Evaluations at Clary Clinic
At Clary Clinic in St. Cloud, I provide comprehensive memory and dementia evaluations for adults and older adults across central Minnesota.
About 30 days to get started. Many memory clinics have waits of several months.
One patient per day. The evaluation is unhurried, which matters for older adults who tire easily or feel anxious about testing.
If someone you love is changing in ways that don't fit what you expected, you don't have to keep guessing. Call or text us at 320-247-4068 or email admin@claryclinic.com to talk through whether an evaluation makes sense.
