ModulePublished

What is a stroke? (brain basics + types)

A stroke is a brain emergency: blood flow to part of the brain is suddenly cut off or a vessel bursts, and brain cells begin to die within minutes. This lesson explains what a stroke is, the main types, and why every minute counts.

FoundationsEveryoneIntro8 minGrade 7

Educational only

Educational only — not medical advice.

Get help now

If you think someone is having a stroke, call your local emergency number now. Do not wait to see if symptoms improve.

Key takeaways

  • Explain in plain language what a stroke is and why the brain is so vulnerable
  • Distinguish ischemic from hemorrhagic stroke by their cause and treatment
  • Explain why 'time is brain' and why a TIA is still an emergency

Why this matters

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What the brain needs to work

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Ischemic stroke — a blockage

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Hemorrhagic stroke — a bleed

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TIA — the warning stroke

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In practice

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Common misconceptions

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Key takeaways

  • A stroke is a brain emergency caused by a blocked vessel (ischemic, ~87%) or a bleed (hemorrhagic, ~13%).
  • Brain cells die quickly without blood — “time is brain.”
  • A brain scan comes first because clots and bleeds are treated in opposite ways.
  • Even symptoms that disappear (a TIA) are an emergency — call for help.

Practice check

What you’ll practice

These questions are untimed. After you answer all of them, you’ll see your score and a clear next lesson or reference step.

0 of 5 answered

Question 1

1. Clinicians describe stroke care with the phrase “time is brain.” What does this actually mean?

Question 2

2. Match each type of stroke to what is happening in the brain.

Question 3

3. Which statements about ischemic stroke are true? Select all that apply.

Question 4

4. Your father’s face droops and his speech slurs at dinner, then he is completely back to normal two minutes later and says he feels fine. What is the best action?

Question 5

5. A brain scan is done before giving clot-busting medicine partly to make sure the stroke is not a bleed.

References

  1. Tier 1American Stroke Association2024
    About Stroke
  2. Tier 1American Stroke Association2024
    Types of Stroke
  3. Tier 1Centers for Disease Control and Prevention2024
    Stroke Facts