Alzheimer's disease is the most common cause of dementia, but it is not the only one. Vascular dementia, Lewy body dementia, and frontotemporal dementia can look similar at first and still call for different day-to-day support. This page is educational. It is not a diagnosis and it is not treatment advice.
Families in Houston who are comparing options can start with the Houston home care overview and then match help to the person's actual symptoms and routines.
How Alzheimer's Disease Differs From Dementia Overall
Dementia is an umbrella term for a decline in memory, thinking, or daily function that is severe enough to interfere with everyday life, while Alzheimer's disease is a specific brain disease and the most common cause of that decline. The two words are related, but they are not interchangeable.
A person can have dementia without having Alzheimer's disease. A person can also have more than one cause of dementia at the same time. Only a qualified clinician can sort out the cause. Families should not rely on this page, or on online checklists, to name a type.
For a plain-language federal overview, see the CDC page on Alzheimer's disease and dementia.
Alzheimer's Disease
Alzheimer's disease typically develops slowly and often first affects the ability to form new memories, then gradually involves more thinking skills and everyday tasks. Early changes may include repeating questions, misplacing items, or having trouble with familiar routes or bills. Later on, many people need more help with dressing, bathing, meals, and staying safe at home.
Because memory loss is often prominent, families frequently look for structured routines and memory care at home that emphasize cues, familiar surroundings, and consistent caregivers. That is a care-planning choice, not a medical treatment and not a diagnosis.
Vascular Dementia
Vascular dementia is linked to reduced blood flow in the brain, such as after a stroke or damage to smaller blood vessels, and symptoms can appear suddenly or in a stepwise pattern rather than in one smooth, gradual slide. People may have more trouble with planning, attention, or walking than with storing new memories, though memory can still be affected.
Care planning often focuses on fall risk, a predictable daily schedule, and extra help when function changes after a hospital stay. Some families add hospital discharge care when a stroke or other vascular event changes what the person can safely do at home.
Dementia With Lewy Bodies
Dementia with Lewy bodies is associated with abnormal protein deposits in the brain and often includes fluctuating alertness, vivid visual hallucinations, sleep disruption, and movement changes that can resemble Parkinson's disease. Memory may be less affected at first than attention, visual perception, or daytime sleepiness.
These features can change from hour to hour. Families sometimes need extra supervision for safety, help with walking and transfers, and calm, unhurried companion care during confusing or fearful moments. Questions about medicines belong with the person's own clinicians. This page does not recommend any medication or treatment.
Frontotemporal Dementia
Frontotemporal dementia more often changes personality, behavior, judgment, or language before it changes short-term memory, and it frequently begins at a younger age than typical late-onset Alzheimer's disease. A person may seem socially unlike themselves, lose impulse control, or struggle to find words while still recalling recent events.
Care planning may emphasize supervision around spending, driving, or socially risky situations, plus support for communication. Family caregivers can become exhausted by behavior changes, so scheduled respite care is often part of a sustainable plan.