Dementia and Alzheimer's disease are often used as if they mean the same thing. They are closely related, but they are different. Dementia is an umbrella term for a collection of symptoms that affect memory, thinking, and daily function. Alzheimer's is a specific disease, and the most common cause of dementia.

Knowing the difference, and knowing which memory changes are part of ordinary aging, helps you decide when a closer look is worthwhile, whether the concern is your own or a parent's. Several causes of memory and thinking problems are treatable, which makes an early, thorough evaluation one of the most useful steps a family can take. This guide explains how the terms relate, how normal aging compares with warning signs, which treatable causes are checked first, and what an evaluation looks like.

Dementia and Alzheimer's: How They Relate

The Alzheimer's Association defines dementia as an umbrella term that describes a collection of symptoms, while Alzheimer's is a specific disease. Alzheimer's accounts for 60 to 80 percent of dementia cases. An estimated 7.4 million Americans age 65 and older are living with Alzheimer's in 2026, according to the Alzheimer's Association, which is about 1 in 9 people in that age group. The organization estimates that about 580,000 people age 65 and older in Florida are living with the disease.

Those numbers explain why so many families in Naples have questions about memory. They also explain why a clear, careful evaluation matters so much. A specific diagnosis guides treatment, planning, and support for years to come.

Other Types of Dementia

Alzheimer's is the most common cause of dementia, but several other types are worth knowing about. Vascular dementia is a decline in thinking skills caused by conditions that block or reduce blood flow to the brain. Lewy body dementia is a progressive dementia that leads to a decline in thinking, reasoning, and independent function. Frontotemporal dementia refers to a group of disorders caused by progressive nerve cell loss in the brain. Mixed dementia describes brain changes from more than one type occurring at the same time.

Identifying the type matters, because each one follows a different course and calls for a different plan. That is one of the main goals of a thorough evaluation.

Normal Aging Compared With Warning Signs

Some changes in memory are a normal part of aging. The Alzheimer's Association offers a helpful comparison between typical age-related changes and the warning signs that deserve an evaluation.

Forgetting a name or an appointment now and then, and remembering it later, is typical. Memory loss that disrupts daily life, such as asking the same question repeatedly, is worth evaluating. An occasional error managing a bill is typical, while new trouble planning, following a recipe, or keeping track of monthly finances is worth a closer look. Losing track of the day of the week and then figuring it out is common. Confusion about time or place that does not resolve is not.

Language and judgment follow the same pattern. Sometimes searching for the right word is part of aging, while new trouble following or joining a conversation deserves attention. Misplacing things and retracing your steps to find them is typical. Putting things in unusual places and being unable to retrace those steps is a warning sign. An occasional poor decision is normal, while a pattern of poor judgment, especially around money or safety, is worth evaluating. Finally, becoming irritable when a familiar routine is disrupted is common with age, while marked changes in mood or personality, or withdrawal from activities a person used to enjoy, deserve a conversation with a physician.

Treatable Causes Worth Ruling Out First

Memory and thinking problems do not always come from dementia. MedlinePlus, the National Library of Medicine's health resource, lists several causes that may be stopped or reversed if they are found soon enough. A thorough evaluation checks for these first:

  • Medication side effects. Some medicines, including certain sedatives, sleep aids, and anticholinergic medications, can affect memory and attention.
  • Low vitamin B12. A deficiency can affect memory and is identified with a simple blood test.
  • Thyroid problems. An underactive thyroid can slow thinking and cause fatigue.
  • Blood chemistry changes. Shifts in blood sugar, sodium, or calcium levels can affect thinking.
  • Depression, which can affect concentration and memory in older adults.
  • Infections. In older adults, an infection such as a urinary tract infection can cause sudden confusion.
  • Normal pressure hydrocephalus, a buildup of fluid in the brain that the Alzheimer's Association describes as one of the few causes of dementia that can be controlled or reversed with treatment.
  • Heavy alcohol use. Over time, heavy drinking can affect memory.

Each of these can be checked during a careful evaluation, and finding one can change the outlook considerably.

What Mild Cognitive Impairment Means

Some people notice changes that go beyond ordinary aging but do not interfere with independence. Physicians call this mild cognitive impairment, or MCI. The Alzheimer's Association estimates that 10 to 15 percent of people living with MCI develop dementia each year, and many others remain stable for years. A diagnosis of MCI is a reason for careful follow-up, regular reassessment, and close attention to the risk factors that can still be changed.

READ: Expert Guidance for Caring for Your Aging Parents in Naples

What Lowers Dementia Risk

The 2024 Lancet Commission on dementia identified 14 modifiable risk factors that, together, could prevent or delay nearly half of dementia cases. Two of the largest are untreated hearing loss and high LDL cholesterol in midlife. Other factors include high blood pressure, diabetes, physical inactivity, smoking, excess alcohol, social isolation, depression, and untreated vision loss.

Many of these are managed in primary care, which places your primary care physician in a strong position to lower your long-term risk. The same habits that protect the heart tend to protect the brain: regular physical activity, good control of blood pressure and blood sugar, healthy cholesterol levels, and avoiding smoking. Staying socially connected and mentally engaged supports brain health too, whether through time with family and friends, volunteering, classes, or hobbies that involve learning something new.

Hearing, Vision, and Sleep

Some of the most practical steps in a memory evaluation involve the senses and sleep. Untreated hearing loss is one of the largest modifiable risk factors identified by the Lancet Commission, and untreated vision loss was added to the list in that same report. Hearing and vision problems can also make memory seem worse than it is, since a person who cannot hear a conversation clearly will struggle to remember it. A hearing test and an eye exam are simple, useful parts of a thorough evaluation, and hearing aids or updated glasses can make a meaningful difference in daily life.

Sleep matters as well. Poor sleep affects attention and memory at any age, and severe sleep loss can contribute to confusion in older adults. Questions about snoring, daytime sleepiness, and sleep schedules belong in every memory evaluation. Our page on sleep, insomnia, and sleep apnea explains how we evaluate sleep concerns.

What an Evaluation Looks Like

An evaluation for memory concerns usually begins with a detailed conversation, ideally with a family member present who has noticed the changes. From there, your physician reviews every medication and supplement, performs a physical and neurological exam, and uses a structured cognitive assessment. Bloodwork checks for treatable causes such as low B12 and thyroid problems, and our labs and diagnostics service can draw it in our office or at a local lab you prefer. Brain imaging or a referral to a neurologist or memory specialist follows when the findings call for it. The goal is a clear explanation of what is causing the change, and a plan for what comes next.

How Families Can Prepare

Family members often notice changes before the person experiencing them does, and bringing those observations to the visit helps give the physician a clear picture of what is going on. Before the appointment, write down specific examples of what has changed and roughly when each change started. Note whether the changes came on gradually or suddenly, since a sudden change can point toward a treatable cause such as an infection or a medication effect. Bring every medication and supplement, including sleep aids and over-the-counter products, and list any recent illnesses, falls, hospital stays, or changes in mood or sleep. Share any family history of dementia, stroke, or other neurological conditions. With the patient's consent, a family member who attends the visit can add context and help remember the plan.

When to Seek Care Right Away

Most memory changes develop gradually, and some call for prompt attention. Sudden confusion, a rapid change in alertness, new trouble speaking, weakness on one side of the body, or a severe headache should be evaluated immediately, since these can signal a stroke, an infection, or another urgent problem. Call 911 for any signs of a stroke.

Planning Ahead and Supporting a Parent

A diagnosis of mild cognitive impairment or dementia raises important questions about the future. Planning early, while the person can take part fully in decisions, gives families clarity and peace of mind. That planning often includes naming a health care proxy, documenting wishes about future medical care in an advance directive, reviewing financial and legal arrangements, and discussing living arrangements and support at home.

Many adult children manage a parent's care from another state, and staying connected matters even more when memory is a concern. With your parent's consent, a physician can update you after visits and share any changes in the plan. Arranging a local contact to check in regularly, keeping a shared calendar of appointments, and making sure medications are organized all help your parent stay safe and independent for as long as possible. Our page for adult children of aging parents describes how we support families in this situation.

How Naples Concierge Health Approaches Memory Concerns

Physicians Dr. Jonathan Marsh and Dr. Danielle Grossman-Stuart evaluate memory concerns with the time a careful assessment requires, including a full medication review and testing for treatable causes. Dr. Marsh has spoken publicly about Alzheimer's prevention, including a TEDx talk that received an Editor's Choice honor. We coordinate with neurologists and other specialists when needed, and we communicate directly with family members, with the patient's consent. You can read more on our dementia and memory page.

Concerned About Memory Changes in Yourself or a Parent?

To have a memory concern evaluated thoroughly, book a gap assessment with Naples Concierge Health. You can also browse everything Naples Concierge Health offers to see the fuller picture first.

Frequently Asked Questions

What is the difference between Alzheimer's and dementia?

Dementia is a general term for symptoms that affect memory, thinking, and daily function. Alzheimer's is a specific disease that causes dementia, and it accounts for 60 to 80 percent of cases.

Which is worse, dementia or Alzheimer's?

The two are not separate conditions to compare. Alzheimer's is one cause of dementia. How symptoms progress depends on the specific type of dementia and on the individual.

Is forgetfulness a normal part of aging?

Occasional forgetfulness is common, such as forgetting a name and remembering it later. Memory loss that disrupts daily life, or a steady change that family members notice, is worth evaluating.

Can memory loss be reversed?

Sometimes. Memory problems caused by medication side effects, low B12, thyroid problems, depression, infections, or normal pressure hydrocephalus can improve when the cause is treated. That is why an evaluation checks for these first.

Can hearing loss affect memory?

Yes. Untreated hearing loss is one of the largest modifiable risk factors for dementia identified by the 2024 Lancet Commission. It can also make memory seem worse in daily life, which is why a hearing test is a useful part of a memory evaluation.

When should a family seek an evaluation for a parent?

When a change in memory, judgment, mood, or ability to manage daily tasks is noticeable and persistent. A family member's observations are often the most useful starting point for the physician.

Can dementia risk be lowered?

Research suggests yes. The 2024 Lancet Commission identified 14 modifiable risk factors, including hearing loss, high LDL cholesterol, high blood pressure, and physical inactivity, that together could prevent or delay nearly half of dementia cases.

What should a family bring to a memory evaluation?

Specific examples of the changes noticed and when they began, every medication and supplement, a list of recent illnesses or falls, and any family history of dementia or stroke. A family member's observations are often the most helpful part of the visit.

When is a memory change an emergency?

Confusion that appears over hours or days needs prompt medical attention, as does confusion that comes with slurred speech, facial drooping, one-sided weakness, fever, or a severe headache. Call 911 for any signs of a stroke.

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