What is vascular dementia?

Vascular dementia is cognitive impairment caused by reduced blood flow to the brain — usually from multiple small strokes, a single large stroke, or cumulative damage from long-term cardiovascular disease. It is the second most common dementia after Alzheimer's, accounting for roughly 10 to 20 percent of dementia cases. Unlike Alzheimer's, its underlying cause — vascular disease — is often modifiable through blood pressure control, diabetes management, and stroke prevention.

How is vascular dementia different from Alzheimer's?

Three main differences. Progression: vascular dementia often progresses in stepwise jumps tied to strokes or ischemic events, rather than the smooth decline of Alzheimer's. Symptom profile: executive function (planning, sequencing, judgment) is often affected earlier than memory, while Alzheimer's typically starts with memory. Risk factors: vascular dementia is driven by the same factors as heart disease — high blood pressure, diabetes, smoking, high cholesterol — and the underlying cause can be treated and slowed in a way Alzheimer's cannot.

What causes vascular dementia?

Several mechanisms. Multi-infarct dementia occurs when multiple small strokes accumulate over time. Strategic infarct dementia is a single stroke in a critical location that disrupts cognition. Subcortical vascular dementia is caused by damage to small vessels deep in the brain, often from chronic high blood pressure. Post-stroke dementia develops in the months to year after a significant stroke. Underlying risk factors include hypertension, diabetes, high cholesterol, atrial fibrillation, heart disease, smoking, and sleep apnea.

Can vascular dementia be prevented?

Risk can be meaningfully reduced, though not eliminated. The strongest evidence is for: controlling blood pressure (particularly in midlife), managing diabetes, treating high cholesterol, not smoking, maintaining physical activity, managing atrial fibrillation with appropriate anticoagulation, treating sleep apnea, and minimizing stroke risk. Unlike Alzheimer's, the modifiable pathway in vascular dementia is substantial — which is part of why attention to cardiovascular health in midlife affects dementia risk decades later.

What is mixed dementia?

Mixed dementia refers to having two or more underlying dementia pathologies at the same time — most commonly Alzheimer's disease plus vascular changes. It is increasingly recognized that mixed pathology is common, especially in older adults. Someone diagnosed with Alzheimer's disease often has vascular changes contributing as well, and vice versa. Treatment in mixed cases targets both causes — vascular risk management plus Alzheimer's-directed therapy when appropriate.

How is vascular dementia diagnosed?

Diagnosis combines clinical evaluation with brain imaging. MRI is central — it shows strokes, small vessel disease, and the patterns characteristic of vascular damage. The clinical picture typically includes stepwise progression or a clear temporal relationship with a stroke, early executive dysfunction, and cardiovascular risk factors in the history. Distinguishing pure vascular dementia from mixed dementia often requires careful clinical judgment and sometimes specialized biomarker testing.

What treatments help with vascular dementia?

The foundation is aggressive management of vascular risk factors: blood pressure control, statin therapy if indicated, diabetes management, anticoagulation for atrial fibrillation, and smoking cessation. These reduce the risk of further vascular events that would worsen dementia. Cholinesterase inhibitors (donepezil, rivastigmine) and memantine are sometimes used off-label in vascular dementia and appear to provide modest benefit, particularly in mixed cases. Physical activity has evidence for slowing decline.

October 30, 20259 min read

Vascular Dementia: The Second Most Common Dementia, Explained

Creator: Mai Shimada, MD
Published: Thu Oct 30 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

By Mai Shimada, MD, Emergency medicine-trained physician, Founder of Tokei Health

Vascular dementia is the second most common cause of dementia, accounting for roughly 10 to 20 percent of cases. It has a specific story — cognitive problems caused by reduced blood flow to the brain — and a specific distinction that matters: unlike Alzheimer's disease, much of the underlying cause is modifiable. This is the dementia where attention to blood pressure, diabetes, and heart health actually moves the trajectory.

This guide covers what vascular dementia is, how it presents, how it is diagnosed, and what families can do — including the specific role of prevention.

What vascular dementia is

Vascular dementia is cognitive impairment caused by reduced blood flow to the brain. The cognitive picture depends on which areas of the brain are affected and how. Unlike Alzheimer's disease, where the cause is specific protein aggregation in specific brain structures, vascular dementia has many underlying mechanisms — united by the common thread that brain tissue is not getting the oxygen and nutrients it needs.

The most important clinical consequence of that difference: vascular dementia is driven by the same processes that cause heart disease and stroke, and those processes are treatable.

The main patterns

Vascular dementia is not one condition but several overlapping ones, grouped by which blood vessels are affected and how.

Multi-infarct dementia

Caused by multiple small strokes (infarcts) accumulating over time. Each individual stroke may be small enough to cause no obvious symptoms in the moment, but the cumulative effect is cognitive decline. Progression is often classically stepwise — periods of stability punctuated by abrupt worsening, though the correlation with individual events is not always obvious.

Strategic infarct dementia

A single stroke in a critical location that disrupts cognition disproportionately to its size. Strokes in specific areas — the thalamus, the basal forebrain, the angular gyrus, or the hippocampus — can produce substantial cognitive changes from a single event.

Subcortical vascular dementia (Binswanger's disease)

Damage to the small vessels deep in the brain's white matter, usually from chronic hypertension. This is often the pattern in people with long-standing high blood pressure. Progression is more gradual than multi-infarct dementia, often looking more like a slow executive dysfunction than a series of strokes.

Post-stroke dementia

Cognitive decline that develops in the months to year after a significant stroke. Roughly 20 to 30 percent of stroke survivors develop dementia within a year of the event, though the frequency depends on the type and severity of stroke.

Cerebral amyloid angiopathy

A distinct condition where amyloid protein deposits in the walls of brain blood vessels, causing bleeds (hemorrhages) and cognitive impairment. Can coexist with or contribute to vascular dementia.

How vascular dementia presents

The clinical pattern is different from Alzheimer's in ways that often point toward the diagnosis:

Stepwise or fluctuating progression

Classic vascular dementia progresses in sudden jumps tied to strokes or ischemic events, with relative stability in between. A person is functioning at one level for months, has a worsening episode over days, and then stabilizes at a new lower level. This is different from Alzheimer's disease, which typically declines more smoothly.

Early executive dysfunction

Planning, sequencing, judgment, and speed of processing are often affected early in vascular dementia — sometimes before memory is clearly impaired. This matters clinically because standard memory-focused cognitive screens may look relatively preserved even when vascular dementia is clearly present. Tests of executive function, like the clock drawing test and parts of the MoCA, are often more sensitive to vascular dementia than the MMSE.

Prominent gait changes

Small vessel vascular dementia often causes early gait changes — shuffling, wide-based unsteadiness, frequent falls. Unlike Lewy body dementia's parkinsonian gait, vascular gait changes often have a broader, more unsteady character. See our shuffling gait symptom page for patterns.

Mood changes

Depression and apathy are common in vascular dementia and can appear before the cognitive picture is clear. Post-stroke depression is a distinct clinical entity.

Urinary symptoms

Early urinary urgency or incontinence can be a feature, particularly in subcortical vascular dementia. Combined with gait changes and cognitive problems, this triad sometimes overlaps with normal pressure hydrocephalus and is worth evaluating carefully.

Partial preservation of memory

Long-term memory and learning may be relatively preserved while executive and processing speed fall. This is a useful distinguishing feature from Alzheimer's, where recent memory typically fails first.

Who is at risk

Vascular dementia risk factors overlap substantially with cardiovascular disease risk factors:

Hypertension — the single biggest modifiable risk factor. Midlife blood pressure matters most.
Diabetes — chronically elevated blood sugar damages small vessels.
High cholesterol — contributes to atherosclerosis in brain vessels.
Smoking — accelerates vascular damage everywhere including the brain.
Atrial fibrillation — causes strokes without treatment; a leading cause of post-stroke dementia.
Sleep apnea — causes repeated oxygen dips and increases vascular risk.
Physical inactivity — independently linked to vascular dementia risk.
Obesity — particularly in midlife.
Chronic kidney disease — small-vessel disease affects multiple organs including the brain.
Age — risk rises substantially after 65.

The key clinical fact: most of these are addressable in midlife, decades before dementia onset. Blood pressure management in one's 40s and 50s affects dementia risk in one's 70s.

Mixed dementia is common

One of the most important recent realizations in dementia research is that mixed pathology is common — many older adults with clinical dementia have more than one underlying cause. The most common combination is Alzheimer's disease plus vascular changes.

Mixed dementia matters because:

It is common — probably more common than "pure" Alzheimer's in older adults
It changes treatment — both vascular risk management and Alzheimer's-directed therapy may be appropriate
It changes research interpretation — studies that treat vascular and Alzheimer's dementia as distinct may underestimate how often they co-occur

A family given a diagnosis of Alzheimer's disease in an older adult should ask directly whether vascular contribution is suspected, because the implications for blood pressure goals, statin use, and cardiovascular care are meaningful.

How vascular dementia is diagnosed

Diagnosis combines three elements:

1. Clinical pattern

Stepwise progression or clear temporal relationship with a stroke
Early executive dysfunction
Presence of cardiovascular risk factors
Gait changes, mood changes, or urinary symptoms consistent with vascular cause

2. Brain imaging

MRI is central. It shows:

Evidence of strokes (old and new)
White matter changes from small vessel disease
Volume of affected tissue
Patterns consistent with vascular rather than neurodegenerative causes

Brain MRI is often more important for vascular dementia diagnosis than for Alzheimer's, where imaging is primarily used to rule out other causes. The specific appearance of small vessel disease, lacunar infarcts, and strategic strokes gives direct evidence of the vascular process.

3. Vascular risk assessment

A careful evaluation of cardiovascular risk factors — blood pressure history, diabetes, lipids, heart rhythm, family history of stroke, prior ischemic events. Missing risk factors are sometimes revealed during the cognitive workup (undiagnosed atrial fibrillation, untreated hypertension, unrecognized sleep apnea), which is itself useful.

What helps

Unlike most dementias, vascular dementia has a substantial preventive and slowing component built on modifiable risk factors.

Managing vascular risk factors

Aggressive attention to:

Blood pressure, with specific targets individualized to the patient. Recent evidence supports tighter control in many older adults than was previously recommended.
Statin therapy if indicated.
Diabetes management.
Anticoagulation for atrial fibrillation — prevents strokes that would otherwise cause further cognitive decline.
Smoking cessation.
Treating sleep apnea with CPAP if present.

These are not just cardiovascular measures. In vascular dementia, they are the primary dementia treatment.

Physical activity

Exercise has evidence for slowing cognitive decline in vascular dementia. Aerobic activity most specifically — 150 minutes per week of moderate-intensity activity is the commonly cited target, though any activity is better than none.

Cognitive and lifestyle factors

The Mediterranean and MIND diets have observational evidence for reducing vascular dementia risk. Social engagement, cognitive activity, and hearing loss treatment are also supported by the Lancet Commission's work on dementia prevention.

Medications

Cholinesterase inhibitors (donepezil, rivastigmine, galantamine) and memantine are often used off-label in vascular dementia, particularly in mixed cases with Alzheimer's pathology. Evidence is modest but meaningful in mixed dementia. A specialist is the right guide on whether to try them.

Specific vascular dementia disease-modifying therapies are an active area of research. Nothing reverses existing damage, but addressing future vascular risk is the core of current treatment.

If you or a family member has vascular dementia

Practical steps that tend to matter:

Ensure a cardiovascular workup has been done. Blood pressure, lipids, diabetes screening, heart rhythm evaluation. Gaps in these directly affect prognosis.
Check for atrial fibrillation. It is commonly undiagnosed. If present, discuss anticoagulation with a cardiologist.
Evaluate for sleep apnea. Strongly linked to vascular dementia and often untreated.
Get medications reviewed. Anticholinergic medications, some antihypertensives with unfavorable cognitive profiles, and overly aggressive blood pressure reductions in older adults can worsen cognition.
Physical activity plan. Even 20 minutes of daily walking matters.
Ask about mixed dementia. If Alzheimer's is also present, both processes should be treated.

If you are reading this for prevention

The preventive evidence for vascular dementia is stronger than for Alzheimer's disease. Concrete steps in midlife that reduce long-term risk:

Monitor and treat blood pressure. If you do not know your numbers in your 40s and 50s, you should.
Screen for and treat diabetes and high cholesterol.
Do not smoke.
Stay physically active.
Evaluate snoring, daytime sleepiness, or suspected sleep apnea with a sleep study.
Manage stress and depression — both affect vascular risk.
Address hearing loss with hearing aids when indicated.

These measures reduce heart attack, stroke, and vascular dementia risk together. The same investment benefits multiple organs.

Related symptoms

The symptoms most often tied to vascular dementia:

Shuffling gait or balance problems — often early in vascular dementia
Difficulty with familiar daily tasks — executive dysfunction
Memory loss: when forgetting is more than aging
Mood and personality changes — depression and apathy common
Incontinence in dementia — can be an early feature

References

Iadecola C, Duering M, Hachinski V, et al. Vascular cognitive impairment and dementia: JACC scientific expert panel. Journal of the American College of Cardiology. 2019;73(25):3326–3344.
Livingston G, Huntley J, Sommerlad A, et al. Dementia prevention, intervention, and care: 2020 report of the Lancet Commission. The Lancet. 2020;396(10248):413–446.
O'Brien JT, Thomas A. Vascular dementia. The Lancet. 2015;386(10004):1698–1706.
American Heart Association / American Stroke Association. Guidelines for the prevention of stroke.

Disclosure: Dr. Shimada is the founder of Tokei Health. This article is informational and is not a substitute for individual medical advice from your own clinician.

Frequently Asked Questions

What is vascular dementia?: Vascular dementia is cognitive impairment caused by reduced blood flow to the brain — usually from multiple small strokes, a single large stroke, or cumulative damage from long-term cardiovascular disease. It is the second most common dementia after Alzheimer's, accounting for roughly 10 to 20 percent of dementia cases. Unlike Alzheimer's, its underlying cause — vascular disease — is often modifiable through blood pressure control, diabetes management, and stroke prevention.
How is vascular dementia different from Alzheimer's?: Three main differences. Progression: vascular dementia often progresses in stepwise jumps tied to strokes or ischemic events, rather than the smooth decline of Alzheimer's. Symptom profile: executive function (planning, sequencing, judgment) is often affected earlier than memory, while Alzheimer's typically starts with memory. Risk factors: vascular dementia is driven by the same factors as heart disease — high blood pressure, diabetes, smoking, high cholesterol — and the underlying cause can be treated and slowed in a way Alzheimer's cannot.
What causes vascular dementia?: Several mechanisms. Multi-infarct dementia occurs when multiple small strokes accumulate over time. Strategic infarct dementia is a single stroke in a critical location that disrupts cognition. Subcortical vascular dementia is caused by damage to small vessels deep in the brain, often from chronic high blood pressure. Post-stroke dementia develops in the months to year after a significant stroke. Underlying risk factors include hypertension, diabetes, high cholesterol, atrial fibrillation, heart disease, smoking, and sleep apnea.
Can vascular dementia be prevented?: Risk can be meaningfully reduced, though not eliminated. The strongest evidence is for: controlling blood pressure (particularly in midlife), managing diabetes, treating high cholesterol, not smoking, maintaining physical activity, managing atrial fibrillation with appropriate anticoagulation, treating sleep apnea, and minimizing stroke risk. Unlike Alzheimer's, the modifiable pathway in vascular dementia is substantial — which is part of why attention to cardiovascular health in midlife affects dementia risk decades later.
What is mixed dementia?: Mixed dementia refers to having two or more underlying dementia pathologies at the same time — most commonly Alzheimer's disease plus vascular changes. It is increasingly recognized that mixed pathology is common, especially in older adults. Someone diagnosed with Alzheimer's disease often has vascular changes contributing as well, and vice versa. Treatment in mixed cases targets both causes — vascular risk management plus Alzheimer's-directed therapy when appropriate.
How is vascular dementia diagnosed?: Diagnosis combines clinical evaluation with brain imaging. MRI is central — it shows strokes, small vessel disease, and the patterns characteristic of vascular damage. The clinical picture typically includes stepwise progression or a clear temporal relationship with a stroke, early executive dysfunction, and cardiovascular risk factors in the history. Distinguishing pure vascular dementia from mixed dementia often requires careful clinical judgment and sometimes specialized biomarker testing.
What treatments help with vascular dementia?: The foundation is aggressive management of vascular risk factors: blood pressure control, statin therapy if indicated, diabetes management, anticoagulation for atrial fibrillation, and smoking cessation. These reduce the risk of further vascular events that would worsen dementia. Cholinesterase inhibitors (donepezil, rivastigmine) and memantine are sometimes used off-label in vascular dementia and appear to provide modest benefit, particularly in mixed cases. Physical activity has evidence for slowing decline.

Take the Clock Drawing Test

A quick, evidence-based screening tool you can take from home in a few minutes.

Start the Clock Drawing Test