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Learning the warning signs of a stroke can feel unsettling, but it is one of the most practical ways to protect yourself and the people you love.

A stroke often begins suddenly. It happens when blood flow to part of the brain is blocked or when a blood vessel in the brain breaks.

Because brain cells can be damaged quickly, stroke symptoms should never be treated as something to watch at home or sleep off.

Some people experience a transient ischemic attack, often called a TIA or “mini-stroke,” before a larger stroke. A TIA can cause the same sudden symptoms as a stroke, but the symptoms may disappear after a few minutes or hours.

Even when symptoms fade completely, emergency medical evaluation is still necessary. A TIA can be an important warning that a full stroke may occur soon.

Knowing what to look for is not about living in fear. It is about recognizing a medical emergency quickly enough to give treatment the best chance of working.

Why Fast Action Matters

During a stroke, every minute matters.

Some treatments work only within a limited period after symptoms begin. The sooner emergency care starts, the better the chance of protecting brain tissue and reducing long-term disability.

Do not wait for symptoms to become severe. Do not wait to see whether they disappear. Do not drive yourself to the hospital if emergency services are available.

Call your local emergency number immediately and note the exact time the person was last known to be well.

8 Warning Signs of a Stroke

1. Sudden Numbness or Weakness

A stroke may cause sudden weakness, heaviness, tingling, or numbness in the face, arm, or leg.

This commonly affects one side of the body.

Possible clues include:

• One side of the face drooping
• Difficulty lifting one arm
• One leg suddenly feeling weak
• Dropping objects without explanation
• Sudden loss of coordination on one side

Even if the weakness lasts only a few minutes and then disappears, seek emergency medical care.

2. Sudden Confusion

A person having a stroke may suddenly seem confused, disoriented, or unable to process familiar information.

They may not know where they are, what is happening, or how to perform an ordinary task.

This should not be dismissed as tiredness, stress, aging, or simple forgetfulness when it appears suddenly.

3. Sudden Trouble Speaking

Speech may become slurred, unclear, unusually slow, or difficult to produce.

The person may know what they want to say but be unable to find the words.

Ask them to repeat a simple sentence. If the words sound strange, incomplete, or difficult to understand, call emergency services.

4. Sudden Trouble Understanding Speech

A stroke can affect the brain’s ability to understand language.

A person may hear words but be unable to understand what they mean. Conversations may suddenly seem confusing or unfamiliar.

This can happen even when the person remains awake and appears physically well.

5. Sudden Vision Changes

Stroke-related vision problems may affect one eye or both eyes.

Possible symptoms include:

• Blurred vision
• Double vision
• Loss of part of the visual field
• Difficulty focusing
• Sudden dimness

Any sudden unexplained change in vision requires immediate medical evaluation.

6. Sudden Partial or Complete Vision Loss

Some people describe sudden vision loss as a curtain or shade being pulled across one eye.

The loss may be complete or may affect only part of the visual field.

Temporary loss of vision can also be a sign of interrupted blood flow and should be treated as an emergency, even if sight returns.

7. Sudden Difficulty Walking or Loss of Balance

A stroke may cause sudden dizziness, unsteadiness, loss of coordination, or difficulty walking in a straight line.

A person may stumble, fall, or feel as if the room is spinning.

Do not encourage someone with these symptoms to keep walking or try to “shake it off.” Help them sit or lie safely while emergency assistance is called.

8. A Sudden, Severe Headache

A sudden, extremely severe headache with no clear cause can be a warning sign of bleeding in or around the brain.

It may be accompanied by:

• Vomiting
• Neck stiffness
• Loss of consciousness
• Confusion
• Weakness
• Vision changes
• Seizure

A headache described as the worst headache of someone’s life needs emergency assessment, particularly when it begins abruptly.

Recognizing the symptoms is only the first step—the FAST method provides a simple way to decide when immediate action is required.