Understanding Lacunar Strokes: Causes, Symptoms, and Recovery
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
A lacunar stroke happens when a blood clot blocks one of the small blood vessels deep inside the brain, in areas such as the thalamus and basal ganglia. It is a life-threatening emergency, and getting treatment as soon as possible is the best way to prevent permanent brain damage and death. Long-term care centers on controlling high blood pressure and on rehabilitation [1].
Quick Answer: What is a lacunar stroke?
A lacunar stroke is a type of ischemic stroke caused by a blockage in a small artery deep in the brain, affecting areas that control movement and sensation. High blood pressure is the most serious risk factor. Symptoms include sudden weakness and slurred speech, so call emergency services immediately. Treatment restores blood flow quickly, followed by rehabilitation. [1]
What the research says
After a lacunar stroke, a lower blood pressure target reduced bleeding in the brain. In the SPS3 trial of 3,020 patients with recent MRI-confirmed lacunar infarcts, a systolic target below 130 mm Hg (versus 130 to 149 mm Hg) gave a non-significant reduction in recurrent stroke (hazard ratio 0.81, 95% CI 0.64 to 1.03) and a significant reduction in intracerebral hemorrhage (hazard ratio 0.37, 95% CI 0.15 to 0.95) over a mean of 3.7 years (SPS3 Study Group, Lancet, 2013 [2]).
Adding clopidogrel to aspirin did not help and caused more bleeding. In 3,020 patients with recent lacunar infarcts, dual antiplatelet therapy did not significantly reduce recurrent stroke compared with aspirin alone (hazard ratio 0.92, 95% CI 0.72 to 1.16) but nearly doubled major hemorrhage (hazard ratio 1.97, 95% CI 1.41 to 2.71) and raised all-cause mortality (hazard ratio 1.52, 95% CI 1.14 to 2.04) (SPS3 Investigators, N Engl J Med, 2012 [3]).
Clot-dissolving medicine appears to help in small-vessel strokes and seems safe, but the evidence is limited. A meta-analysis of 23 studies (only 3 randomized) found that intravenous alteplase was linked to better outcomes (adjusted odds ratio 1.53, 95% CI 1.29 to 1.82 for an excellent outcome at 3 months), with a pooled symptomatic brain bleeding rate of 0.72%. The authors judged the data insufficient for the highest level of recommendation (Karaszewski et al., Transl Stroke Res, 2021 [4]).
What Is a Lacunar Stroke?
A lacunar stroke, or lacunar infarct, is a specific type of ischemic stroke that affects the small, deep blood vessels of the brain. “Infarction” is the medical term for tissue that dies when it isn't getting enough blood flow, which can cause permanent damage if the blockage isn't treated quickly. These strokes are life-threatening medical emergencies and can be fatal [1].
Unlike strokes that affect larger, more superficial vessels, lacunar strokes occur in the brain's inner sections, such as the basal ganglia and thalamus, which control sensation and movement. Healthcare providers use the terms “lacunar stroke” and “lacunar infarct” interchangeably [1].
A lacunar infarct: a small clot blocks a deep brain vessel in the area of the basal ganglia and thalamus.
What are the symptoms of a lacunar stroke, and what is BE FAST?
Lacunar stroke symptoms share many features with other ischemic strokes and often appear suddenly. They include weakness or paralysis on one side of the face and body, slurred or garbled speech (dysarthria), loss of muscle control on one side of the face, aphasia (trouble speaking or a complete loss of speech), and a sudden worsening or loss of senses such as vision, hearing, smell, taste, and touch. Blurry or double vision, clumsiness or loss of coordination (ataxia), dizziness or vertigo, and nausea and vomiting can also occur [1].
To recognize the warning signs quickly, use the BE FAST acronym [1]:
Letter | Warning sign | What to look for |
|---|---|---|
B | Balance | A sudden loss of balance or coordination. |
E | Eyes | Sudden vision loss or changes in one or both eyes, including blurry or double vision. |
F | Face | A droop on one or both sides of the face when smiling. |
A | Arms | One arm sags or drops when both are raised. |
S | Speech | Slurred speech or trouble choosing the right words. |
T | Time | Time is critical: call for help immediately and note when symptoms started. |
A transient ischemic attack (TIA), sometimes called a “mini-stroke,” is like a stroke but its effects are temporary. It is often a warning that a true stroke is likely soon, so anyone who has a TIA needs emergency medical care as soon as possible [1].
What causes a lacunar stroke, and what are the main risk factors?
A lacunar stroke happens when a blood clot blocks a blood vessel in the deep layers of the brain. Several conditions can lead to the clots that cause it, including high blood pressure, high cholesterol, clotting disorders, COVID-19, and infections that destroy tissue, such as sepsis, where dead tissue can break free and lodge in the brain. High blood pressure is the most serious risk factor [1].
Anyone can have a lacunar infarct, but some groups have a higher risk [1]:
People older than 65.
People who are Black.
People who smoke or use other forms of tobacco or nicotine, including vaping.
People who use recreational or non-prescription drugs.
People with certain conditions: atrial fibrillation, alcohol use disorder, atherosclerosis (hardened arteries), diabetes, or a genetic variation in the NOTCH3 gene.
How is a lacunar stroke diagnosed and managed in an emergency?
A healthcare provider diagnoses a lacunar stroke with a neurological exam, a physical exam, and tests that may include blood tests, a CT scan, an MRI, an electrocardiogram (EKG), and an electroencephalogram (EEG) [1].
The most important part of treatment is restoring blood flow to the brain as fast as possible to reduce the risk of permanent brain damage and death [1]. The two most common treatments are:
Thrombolytic therapy: medicines that dissolve clots. Providers usually use them only if it has been fewer than four hours since symptoms began, because they can increase the risk of dangerous internal bleeding.
Mechanical thrombectomy: a procedure that removes the clot through a thin catheter threaded up to the brain. Many lacunar strokes affect vessels that are too small for thrombectomy, so your care team will recommend the best option for your situation.
You may need other treatments too. Blood thinners (anticoagulants) may be started after thrombolytic therapy, and blood pressure medicines are used to keep your pressure at a safe level [1].
Emergency stroke treatment pathways: clot-dissolving medicine and clot removal. Time windows vary by hospital and by situation.
What do rehabilitation and long-term recovery after a lacunar stroke involve?
Rehabilitation after a lacunar stroke helps you adjust to changes in your brain and body and may help you regain lost abilities or adapt to new ones. Because lacunar strokes affect areas that control movement and communication, you may need a combination of therapies [1]:
Speech therapy to regain or improve language and speaking, and to control the muscles used to talk, breathe, eat, and swallow. Antiplatelet medicines are also commonly needed after a lacunar stroke.
Physical therapy to strengthen muscles, improve balance, and regain the use of the arms and legs.
Occupational therapy to help you safely complete daily tasks, especially those that need precise movements.
Cognitive rehab to improve memory, concentration, and other mental abilities.
Rehabilitation combines communication practice, physical therapy, and support to rebuild strength and independence.
What is the outlook after a lacunar stroke, and how can another be prevented?
No single recovery timeline is accurate for everyone. Lacunar strokes, like other ischemic strokes, tend to have better survival rates than hemorrhagic strokes, but that doesn't mean you are more or less likely to survive than anyone else. It is possible to regain full use of your brain and body, but you may also have new or different disabilities. Recovery depends on your age, how quickly the stroke was treated, and your overall health, and most people take a few months to recover [1].
Maintaining your overall health is the best way to prevent a lacunar stroke, and it also lowers your risk of another one. Try to [1]:
Manage your blood pressure, cholesterol, and any other health conditions you have.
Eat plenty of healthy foods and maintain a weight that is healthy for you.
Quit smoking.
Get regular physical activity.
Take your medicines as prescribed, especially blood thinners, and see your provider for regular checkups.
Depression and anxiety are extremely common after a stroke, so remember your mental health too and talk to your provider if you need support. People who have had a lacunar stroke also have a higher risk of complications such as deep vein thrombosis, heart attack, pneumonia, pulmonary embolism, and seizures. Call emergency services right away if you think you are having stroke symptoms again [1].
What is the bottom line on lacunar strokes?
A lacunar stroke is a serious medical event that strikes deep structures of the brain. Although the vessels involved are small, the impact on movement, sensation, and overall health can be profound. Recognizing the BE FAST warning signs and getting emergency care right away greatly improves your chances of survival and recovery, and managing risk factors such as high blood pressure is the most effective way to prevent these strokes.
Your next step: if you or a loved one has sudden weakness, slurred speech, or loss of balance, don't wait. Call emergency services immediately. If you have high blood pressure, talk with your healthcare provider today about a long-term plan for stroke prevention.
Frequently Asked Questions
What is a lacunar stroke?
A lacunar stroke is a type of ischemic stroke caused by a blood clot blocking a small blood vessel deep in the brain.
Is a lacunar stroke fatal?
Lacunar strokes are life-threatening medical emergencies and can be fatal, especially without prompt treatment. Ischemic strokes like these tend to have better survival rates than hemorrhagic strokes, but outcomes vary from person to person.
What is the most common cause?
High blood pressure (hypertension) is the most serious risk factor for lacunar strokes.
What does “infarction” mean?
Infarction is the medical term for tissue that dies because it isn't getting enough blood flow.
What is a TIA?
A transient ischemic attack is a “mini-stroke” whose effects are temporary. It is often a warning that a true stroke is likely soon, so it needs emergency care.
Can lacunar strokes be treated with surgery?
Mechanical thrombectomy can remove a clot, but many lacunar strokes affect vessels that are too small for the procedure.
What is thrombolytic therapy?
Thrombolytic therapy uses medicines that dissolve blood clots. Providers usually use it only when it has been fewer than four hours since symptoms began, because it can raise the risk of dangerous bleeding.
How is it diagnosed?
Providers use a neurological exam, a physical exam, and tests such as blood tests, a CT scan, an MRI, and an electrocardiogram.
What is the role of rehabilitation?
Rehab helps you regain abilities and adjust to changes after a stroke through speech, physical, occupational, and cognitive therapy.
Who is at the highest risk?
People older than 65, people who are Black, people who smoke or use other tobacco or nicotine products, and people with high blood pressure, diabetes, atrial fibrillation, or atherosclerosis have a higher risk.
References
Cleveland Clinic. Lacunar Stroke (Lacunar Infarct). Cleveland Clinic. November 25, 2024. https://my.clevelandclinic.org/health/diseases/lacunar-stroke
SPS3 Study Group, Benavente OR, Coffey CS, et al. Blood-pressure targets in patients with recent lacunar stroke: the SPS3 randomised trial. The Lancet. 2013;382(9891):507-515. PMID 23726159. https://doi.org/10.1016/S0140-6736(13)60852-1
SPS3 Investigators, Benavente OR, Hart RG, et al. Effects of clopidogrel added to aspirin in patients with recent lacunar stroke. New England Journal of Medicine. 2012;367(9):817-825. PMID 22931315. https://doi.org/10.1056/NEJMoa1204133
Karaszewski B, Wyszomirski A, Jabłoński B, et al. Efficacy and safety of intravenous rtPA in ischemic strokes due to small-vessel occlusion: systematic review and meta-analysis. Translational Stroke Research. 2021;12(3):406-415. PMID 33641037. https://doi.org/10.1007/s12975-021-00890-9
Medical disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you suspect a stroke, call emergency services immediately. The clinical information in this guide reflects source material last reviewed in November 2024.
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