photo of blood vessels in brain mri
1 / 13

What Is a Stroke?

A stroke is a medical emergency. It happens when a blood vessel in the brain bursts or, more commonly, when a blockage happens. Without treatment, cells in the brain quickly begin to die. This can cause serious disability or death. If a loved one is having stroke symptoms, call 911 right away.

Swipe to advance
photo of confused man
2 / 13

Stroke Symptoms

Call 911 right away about signs of a stroke, which may include sudden:

  • Numbness or weakness of the body, especially on one side
  • Vision changes in one or both eyes, or trouble swallowing
  • Severe headache with an unknown cause
  • Problems with dizziness, walking, or balance
  • Confusion, trouble speaking or understanding others
Swipe to advance
photo of fast acronym signs of stroke
3 / 13

Think FAST

The FAST test helps spot symptoms. It stands for:

Face drooping. Ask for a smile. Does one side droop?

Arm weakness or numbness.

Speech. Can the person repeat a simple sentence? Do they have trouble or slur words?

Time to call 911. Don’t delay.

Swipe to advance
photo of brain tissue death
4 / 13

Time = Brain Damage

Every second counts. Without oxygen, brain cells begin dying within minutes. Once brain tissue has died, the body parts controlled by that area won’t work right. This makes stroke a top cause of long-term disability. There are clot-busting drugs that can curb brain damage, and they must be given in a short time -- usually within 3 hours of when symptoms start.

Swipe to advance
photo of technicians studying mri
5 / 13


Tests may start when you’re still in the ambulance. Once you get to the ER, you’ll get imaging tests such as a CT scan, MRI, or ultrasound. You may get other types of tests, such as an EKG (checks your heart’s electrical activity) and an EEG (checks your brain’s electrical activity).

Swipe to advance
photo of blood clot
6 / 13

Ischemic Stroke

This is the most common type of stroke: Nearly nine out of 10 fall into this category. An ischemic stroke happens when a blood clot blocks the supply of blood to or in the brain. The clot may start in that spot or travel through the blood from elsewhere in the body. Clogged arteries are a top cause.

Swipe to advance
photo of hemorrhagic stroke mri
7 / 13

Hemorrhagic Stroke

Hemorrhagic strokes happen when a weakened blood vessel in the brain bursts. The result is bleeding inside the brain that can be hard to stop. The most common cause is high blood pressure. Other causes include aneurysms and AVMs (arteriovenous malformations), which weaken blood vessels in the brain.

Swipe to advance
photo of dripping faucet
8 / 13

'Mini-Stroke' (TIA)

Transient ischemic attacks, often called "mini-strokes," are also an emergency. When they happen, blood flow is temporarily hampered in part of the brain, causing stroke-like symptoms. When the blood flows again, the symptoms stop. You can’t tell at the time if it’s a stroke or TIA. So call 911. Having a TIA is also a warning sign, so see your doctor if you think you've had one.

Swipe to advance
photo of emergency room sign
9 / 13

Emergency Treatment

Ischemic strokes: The goal is to restore blood flow. A clot-busting medication called tPA is very good at dissolving clots and cutting the chance of long-term damage, but it must be given in time -- usually within 3 hours. Hemorrhagic strokes: These are harder to manage. Treatment usually involves trying to control high blood pressure, bleeding, and brain swelling.

Swipe to advance
10 / 13


Ischemic strokes: Clogged arteries are a top cause. Plaque made of fat, cholesterol, and other things builds up in the arteries, leaving less space for blood to flow. A blood clot may lodge in this narrowed space and cause an ischemic stroke. All that plaque makes it easier for a clot to form and can also rupture, blocking blood flow.

Hemorrhagic strokes: These can happen if uncontrolled high blood pressure bursts a weakened artery.

Swipe to advance
photo of four stroke risk factors
11 / 13

Risk Factors

Your chance of having a stroke rises with age and if you have:

  • Had a stroke or TIA before
  • Heart disease
  • High blood pressure
  • High cholesterol
  • Diabetes
  • Obesity
  • Sickle cell disease

Smoking, heavy drinking, and not being active also raise your risk.


Swipe to advance
photo of cheeseburger and fries
12 / 13

What’s On Your Plate?

Eating too much fat and cholesterol can cause plaque to narrow arteries. Too much salt may lead to high blood pressure. Eating plenty of fruits, vegetables, whole grains, and fish may help lower your stroke risk.

Swipe to advance
photo of mature couple cooking
13 / 13

Lowering Your Risk

Find out if you have any conditions that you need to treat to help prevent a stroke. That may mean taking medicine and also boosting healthy habits, from the foods you eat to being active and not smoking. It’s never too late to start.

Swipe to advance

Up Next

Next Slideshow Title

Sources | Medically Reviewed on 01/08/2020 Reviewed by Suzanne R. Steinbaum, MD on January 08, 2020


1) mr.suphachai praserdumrongchai / Getty Images

2) Comstock / Getty Images

3) (Clockwise from top left)  MangoStar_Studio / Thinkstock, WebMD, George Doyle / Thinkstock, Ingram Publishing / Thinkstock

4) ISM / Phototake

5) gorodenkoff / Getty Images

6) R. SPENCER PHIPPEN / Medical Images

7) PRinc_SB4135 / Photo Researchers

8) swisoot / Getty Images

9) Adam Calaitzis / Getty Images

10) (Left to right)  Christoph Burgstedt / Thinkstock, zencreation / Getty Images

11) (Clockwise from top left) / Getty Images, Lars Neumann / Thinkstock, RapidEye / iStock, Kwangmoozaa / Getty Images

12) bhofack2 / Thinkstock

13) Jupiterimages / Getty Images



American Heart Association: “Stroke Symptoms: FAST.”

CDC: “About Stroke,” “Stroke Signs and Symptoms.”

National Institute on Aging: “Rehabilitation After Stroke.”

National Institute of Neurological Disorders and Stroke: “Post-Stroke Rehabilitation Fact Sheet.”

American Stroke Association: “Why Getting Quick Stroke Treatment Is Important,” Ischemic Stroke (Clots),” “Stopping the Bleeding in a Hemorrhagic Stroke.”

NYU Langone Health: “Surgery for Carotid Artery Disease.”

Reviewed by Suzanne R. Steinbaum, MD on January 08, 2020

This tool does not provide medical advice. See additional information.

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.