FAST Ways to Spot Stroke Signs in Seconds

A stroke occurs when blood flow to the brain is blocked, cutting off the oxygen and nutrient supply to the brain. The first signs of stroke are sudden numbness or weakness, especially on one side of the body, trouble speaking, or vision problems, signifying a significant decline in function as brain cells begin to die, often within minutes. Because a stroke is a medical emergency that can lead to permanent brain damage, disability, or death, quick action is critical. Knowing the warning signs can save a life, and one of the easiest ways to recognize a possible stroke is by using the F.A.S.T. method. The F.A.S.T. test helps you to quickly identify symptoms and determine when to call for emergency medical help.

The F.A.S.T. method is a simple, easy-to-remember tool designed to help quickly identify the warning signs of a stroke and determine when emergency care is needed. F.A.S.T. stands for: Face, Arms, Speech, and Time to Call.

Because stroke symptoms can appear suddenly and worsen rapidly, using the F.A.S.T. method is potentially life-saving if you act quickly. If you notice any of the signs listed below, call 911 immediately.

F: Face Drooping

Facial changes are often one of the quickest and most visible signs that a stroke may be occurring.

Common Symptoms:

• One side of the face appears drooped or numb
• An uneven or lopsided smile
• Difficulty controlling facial muscles on one side

How to Tell:

Ask the person to smile.

• Does one side of their face droop or fail to move?
• Does their smile look uneven or strained?

A: Arm Weakness

Sudden arm weakness or numbness can signal that the brain is not sending proper signals to the body.

Common Symptoms:

• Weakness or numbness in one arm
• Trouble lifting or controlling one arm
• One arm feels heavier than the other

How to Tell:

Ask the person to raise both arms

• Does one arm drift downward?
• Are they unable to lift one arm fully?

S: Speech Difficulty

A stroke can interfere with the brain’s ability to produce or understand language.

Common Symptoms:

• Slurred, garbled, or unclear speech
• Trouble forming words or sentences
• Sudden confusion during conversation

How to Tell:

Ask the person to repeat a simple sentence

• Is their speech slurred or hard to understand?
• Do they seem confused by what you’re saying?

T: Time to Call 911

When it comes to stroke, every minute matters, and fast action can help reduce the risk of permanent brain damage.

Common Symptoms:

• Stroke symptoms can worsen quickly
• Waiting can increase the risk of long-term disability

How to Tell:

• Call 911 right away if any F.A.S.T. symptoms are present
• Do not wait to see if symptoms improve
• If possible, note when symptoms first began

Other Stroke Symptoms to Watch For

Some stroke symptoms may fall outside of the F.A.S.T. framework but are just as serious and require immediate attention. If you recognize these symptoms, treat them as a medical emergency and call 911 immediately.

Other Stroke Symptoms:

• Sudden numbness in the face, arm, or leg
• A sudden, severe headache with no known cause
• Trouble seeing in one or both eyes
• Difficulty walking, dizziness, or loss of balance