Stroke Warning Signs: BE FAST Symptoms and What to Do

Stroke Warning Signs: BE FAST Symptoms and What to Do

The main stroke warning signs come on suddenly: loss of balance, vision changes, a drooping face, a weak arm, and slurred or strange speech. The memory aid BE FAST covers all five, and the "T" stands for time: if you see any one of these signs, call 911 right away, even if the symptoms fade. Quick action matters because the most effective stroke treatments only work within a few hours of the first symptom.

This article is for general information and is not medical advice.

Key takeaways

  • BE FAST stands for Balance, Eyes, Face, Arms, Speech and Time. Any one sudden sign is enough reason to call 911.
  • About 87% of strokes are ischemic (caused by a blockage). The rest are hemorrhagic (caused by bleeding in the brain).
  • A TIA, or "mini-stroke," is a warning sign of a future stroke and needs emergency care even if symptoms go away.
  • Call an ambulance instead of driving. Note the exact time symptoms started.
  • High blood pressure is the top risk factor you can change, and many strokes can be prevented.

What are the BE FAST stroke warning signs?

BE FAST is a quick check you can do in under a minute to spot a possible stroke. The CDC lists the BE FAST steps as follows:

LetterWhat it meansHow to check
BBalance lossAsk if the person feels dizzy or off balance, or watch for sudden trouble walking.
EEyesAsk if they suddenly have trouble seeing in one or both eyes.
FFaceAsk them to smile. Does one side of the face droop?
AArmsAsk them to raise both arms. Does one arm drift downward?
SSpeechAsk them to repeat a simple phrase. Is speech slurred or strange?
TTimeIf you see any of these signs, call 911 right away.

The CDC also lists a few other sudden symptoms that can point to a stroke:

  • Numbness or weakness in the face, arm, or leg, especially on one side of the body
  • Confusion, trouble speaking, or difficulty understanding speech
  • Dizziness or lack of coordination
  • A severe headache with no known cause

The key word is sudden. A person may not notice their own symptoms, so the people around them often need to make the call.

Can a stroke look like something else?

Yes. People sometimes mistake a stroke for a bad migraine or simple tiredness. If you get migraines, our guide on how to spot a migraine before it starts explains typical warning signs. But a new type of headache, the worst headache of your life, or a headache with weakness or vision loss should be treated as an emergency.

What are the main types of stroke?

There are two main types of stroke, ischemic and hemorrhagic, plus a short-lived warning event called a TIA. All three need emergency care, but they happen in different ways.

Ischemic stroke

An ischemic stroke happens when a clot or other material blocks a blood vessel that supplies the brain. Plaque (a fatty buildup inside the artery wall) can also narrow the vessel. According to CDC stroke statistics, about 87% of all strokes are ischemic.

Hemorrhagic stroke

A hemorrhagic stroke happens when a blood vessel in the brain leaks or bursts. The CDC explains that the leaked blood puts pressure on brain cells and damages them. High blood pressure and aneurysms (weak, balloon-like bulges in an artery wall) are two conditions that can lead to this type of stroke.

Transient ischemic attack (TIA)

A TIA, often called a "mini-stroke," briefly blocks blood flow to the brain, usually for no more than about 5 minutes. The CDC notes that without treatment, more than a third of people who have a TIA go on to have a major stroke within a year, and 10% to 15% have one within 3 months. You cannot tell a TIA from a stroke while it is happening, so call 911 either way.

Curious about unusual triggers? Our article on whether sneezing can cause a stroke covers the real risks.

What should you do immediately if you think someone is having a stroke?

Call 911 right away, note the time symptoms started, and let the ambulance crew take the person to the hospital. These steps give the person the best chance at treatment that can limit brain damage.

  1. Call 911 at once. Do not wait to see if symptoms improve. The CDC advises calling 911 right away for any stroke symptom.
  2. Check the time. Write down or remember when the symptoms first appeared, or the last time the person was seen acting normally. Doctors use this to decide which treatments are safe.
  3. Do not drive. The CDC says not to drive yourself or let someone else drive you. Paramedics can start care on the way and alert the hospital before you arrive.
  4. Keep the person safe. Help them sit or lie down in a comfortable position, loosen tight clothing, and stay with them.
  5. Do not give food, drink or pills unless the 911 dispatcher or a medical professional tells you to.
  6. Gather key facts. If you can, collect the person's medication list, especially any blood thinners, and their health conditions to share with the medical team.

Why not give medicine at home? Doctors cannot tell a clot from a bleed without testing. The American Stroke Association notes that a CT or MRI scan of the brain is used to diagnose the stroke type, and clot-busting drugs are given only after a doctor confirms an ischemic stroke. A drug that helps one type could make the other worse.

Why does time matter so much in a stroke?

Every minute of blocked blood flow destroys brain cells, and the best treatments only work within a limited window. Faster care means a better chance of recovering speech, movement and independence.

A widely cited study in the journal Stroke, titled "Time is brain, quantified," estimated that a typical patient with a large ischemic stroke loses about 1.9 million neurons (nerve cells) each minute without treatment. That adds up to roughly 120 million neurons per hour.

The treatment windows are short. The American Stroke Association says clot-busting drugs (alteplase or tenecteplase) must be given within 4.5 hours of symptom onset. For eligible people with large clots, a procedure called mechanical thrombectomy, where a doctor removes the clot through a thin tube threaded through an artery, can be done up to 24 hours after symptoms begin. The CDC adds that the most effective treatments depend on the stroke being recognized and diagnosed within 3 hours of the first symptoms, and people who reach the hospital late may not qualify.

The CDC reports that someone in the United States has a stroke every 40 seconds, more than 795,000 people have a stroke each year, and about 185,000 of those strokes happen in people who have already had one.

What raises your risk of stroke?

Some risk factors, like age and family history, cannot be changed, but the biggest ones, including high blood pressure, smoking, diabetes and high cholesterol, can be managed. The National Institute of Neurological Disorders and Stroke (NINDS) groups them this way:

Risk factors you cannot changeRisk factors you can manage
Age (risk about doubles each decade after 55)High blood pressure
Biological sexHigh cholesterol
Family history of strokeDiabetes
Race and ethnicitySmoking
Prior stroke or heart attackSubstance use and heavy drinking

NINDS calls high blood pressure the number one risk factor for stroke. People with high blood pressure have two to four times the stroke risk of people without it, before age 80. If you are not sure what your readings mean, see our guide to high blood pressure numbers and what to do about them.

Smoking almost doubles the risk of ischemic stroke on its own, according to NINDS. Atrial fibrillation (an irregular heartbeat that lets blood pool and clot in the heart) is another important cause. Diabetes damages blood vessels over time, so it helps to know the early signs of diabetes and get tested if you have them.

Stroke rarely travels alone. It shares risk factors with heart disease, kidney disease and other long-term conditions, which our overview of the most common chronic diseases explains. Stroke is also linked to memory problems later in life, including vascular dementia, covered in our article on dementia types, symptoms and how to lower your risk.

How can you lower your risk of stroke?

Most of the steps that prevent stroke are the same steps that protect your heart: control blood pressure, stop smoking, stay active and eat well. NINDS researchers have estimated that Americans should be able to prevent 80% of all strokes.

Here is what NINDS recommends:

  • Know and manage your numbers. Work with your doctor on blood pressure, blood sugar and cholesterol, and take prescribed medicines as directed.
  • Treat heart conditions. Follow your plan for atrial fibrillation or other heart problems.
  • Quit smoking. Risk drops significantly about two years after quitting, and by five years it falls to the level of nonsmokers.
  • Move most days. Aim for 30 minutes of moderate activity most days of the week.
  • Eat a varied diet. Cut back on salt and get enough potassium from foods like fruits, vegetables and beans.
  • Limit alcohol and avoid drug misuse. Seek help if you are dependent.

Cholesterol plays a direct role in the plaque that blocks arteries. Our explainer on how cholesterol causes heart disease and how to lower LDL walks through diet and treatment options that also lower stroke risk.

If you have already had a stroke or TIA, keep every follow-up visit and take your medicines exactly as prescribed.

Common mistakes

  • Waiting to see if it passes. Symptoms that fade may be a TIA, which still needs emergency care.
  • Driving to the hospital. An ambulance can start care sooner and route you to a stroke-ready hospital.
  • Calling your doctor's office first. This wastes time. Call 911.
  • Not noting the time. Without a clear start time, doctors may not be able to use some treatments.
  • Thinking stroke only affects older adults. The CDC reports that 38% of people hospitalized for stroke in 2014 were younger than 65.

When to see a doctor

Call 911, not your regular doctor, if you or someone near you has any of these sudden red flags:

  • Face drooping, arm or leg weakness, or numbness on one side of the body
  • Slurred speech, confusion, or trouble understanding others
  • Sudden loss of vision, double vision or blurred vision in one or both eyes
  • Sudden dizziness, loss of balance or trouble walking
  • A sudden, severe headache unlike any you have had before
  • Any of these symptoms that came and went within minutes (a possible TIA)

Make a regular appointment with your doctor if you have high blood pressure, an irregular heartbeat, diabetes, high cholesterol, or a family history of stroke, so you can build a prevention plan.

Frequently asked questions

What does BE FAST stand for?

BE FAST stands for Balance, Eyes, Face, Arms, Speech and Time. It is a quick way to check for sudden loss of balance, vision changes, facial drooping, arm weakness and speech problems. "Time" reminds you to call 911 right away.

Can stroke symptoms go away on their own?

Yes, in a TIA the symptoms often fade within minutes. That does not mean you are safe. A TIA is a warning sign, and many people who have one go on to have a full stroke, often within months, so get emergency care anyway.

How long do you have to get stroke treatment?

Clot-busting drugs must be given within 4.5 hours of symptom onset, and clot removal procedures can help some people up to 24 hours later. Earlier is always better, because brain cells die every minute blood flow is blocked.

Can young people have a stroke?

Yes. Stroke risk rises with age, but strokes can happen at any age. In 2014, more than a third of people hospitalized for stroke in the U.S. were under 65.

What to do next

Take two minutes today to learn BE FAST and share it with the people you live and work with.

  1. Save the BE FAST steps on your phone or post them on your fridge.
  2. Check your blood pressure and ask your doctor what your target should be.
  3. Keep an up-to-date medication list in your wallet or phone.
  4. If you smoke, make a plan to quit.
  5. Ask your doctor about your personal stroke risk at your next visit.

Sources

Last reviewed: October 2026.

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