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Ischemic Stroke
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Blood Heart Circulation

Ischemic Stroke

An ischemic stroke occurs when a blood clot blocks a blood vessel in the brain, cutting off vital oxygen and nutrients.

What is an ischemic stroke?

A stroke happens when there is a loss of blood flow to part of the brain. Brain cells cannot get the oxygen and nutrients they need from blood and start to die within a few minutes, which can cause lasting brain damage, long-term disability, or death. Ischemic stroke is the most common type of stroke. Quick treatment can save a life and improve the chances of recovery.

What causes an ischemic stroke?

Ischemic strokes are usually caused by one or more of the following:

  • A blood clot: A clot can form in an artery that supplies the brain (thrombosis) or travel from another part of the body (embolism).
  • Atherosclerosis: A disease in which plaque—a sticky substance made of cholesterol, fat, and other substances—builds up inside your arteries.
  • Irregular heart rhythms: Conditions like atrial fibrillation can cause clots to form in the heart, which may travel to the brain.
  • Other heart and blood conditions: Such as heart valve diseases or sickle cell disease.

A transient ischemic attack (TIA) is caused by a brief blockage of blood flow to the brain. While it usually lasts only a few minutes, it can indicate a risk for a more serious stroke.

What are the symptoms of ischemic stroke?

Symptoms often happen suddenly and include:

  • Sudden numbness or weakness of the face, arm, or leg (especially on one side of the body)
  • Sudden confusion, trouble speaking, or understanding speech
  • Sudden trouble seeing in one or both eyes
  • Sudden trouble walking, dizziness, loss of balance, or coordination
  • Sudden severe headache with no known cause

If you suspect a stroke, use the F.A.S.T. test:

  • F (Face): Drooping on one side when smiling.
  • A (Arm): Weakness when arms are raised; one arm drifts downward.
  • S (Speech): Slurred or strange speech.
  • T (Time): Time to call 911.

How is an ischemic stroke diagnosed?

To make a diagnosis, your health care provider may perform a physical exam, review your symptoms and medical history, and use imaging tests. Additional heart tests may be conducted to identify the underlying cause.

How is an ischemic stroke treated?

Rapid treatment is essential. Common treatments include:

  • Medicines: Blood thinners or thrombolytics to break up and dissolve existing clots.
  • Surgery or stenting: Used to open narrowed arteries or remove plaque build-up from the carotid arteries.

After treatment, rehabilitation can help regain lost skills. Providers may also prescribe medication to manage blood pressure, cholesterol, or conditions like diabetes to reduce future risk.

Can an ischemic stroke be prevented?

The best way to prevent a stroke is by making heart-healthy lifestyle changes. If lifestyle changes are insufficient, your provider may prescribe medicine to manage risk factors.

Frequently Asked Questions

If you arrive at a qualified stroke center within 4.5 hours of symptom onset, you may receive intravenous tissue plasminogen activator (tPA), which dissolves the clot. Eligibility depends on factors such as blood pressure control, blood‑clotting status, recent surgery, and the exact time of symptom onset. For large‑vessel occlusions, endovascular thrombectomy (mechanical clot removal) can be performed up to 24 hours in selected patients based on advanced imaging that shows viable brain tissue.
Key secondary‑prevention steps include: controlling blood pressure (target <130/80 mm Hg), managing cholesterol with statins, quitting smoking, limiting alcohol, maintaining a healthy weight, and engaging in regular aerobic exercise (at least 150 minutes per week). Antiplatelet agents (aspirin or clopidogrel) or anticoagulants (for atrial fibrillation) are prescribed based on the stroke’s cause. Your doctor may also recommend a low‑salt diet and diabetes control if applicable.
Common evaluations include a carotid ultrasound to look for plaque buildup in the neck arteries, a trans‑cranial Doppler, cardiac monitoring (Holter or event recorder) to detect atrial fibrillation, and an echocardiogram to assess heart valves or chambers. For imaging, you’ll usually be asked to avoid heavy meals and caffeine before a stress test, and to bring a list of current medications. No special preparation is needed for most ultrasound studies, but you should wear comfortable clothing that allows easy access to the neck and chest.
The fastest way to recognize a stroke is the “FAST” mnemonic: Face drooping, Arm weakness, Speech difficulty, and Time to call 911. Additional red‑flag symptoms include sudden vision loss in one or both eyes, severe headache with no known cause, loss of balance or coordination, and sudden confusion. Because brain cells die within minutes, calling emergency services right away dramatically improves outcomes.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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