Stroke Warning Signs: the FAST Test and Why Every Minute Counts
Most strokes give clear warning signs. Learning the FAST test — and acting on it immediately — can protect brain, function, and life.
A stroke happens when blood flow to part of the brain is suddenly cut off, and brain cells begin to die within minutes. Recognizing a stroke and calling 911 right away is the single most important thing you can do. If you suspect a stroke, call 911 — do not drive to the hospital, and do not wait to see whether the symptoms pass.
Know the signs: F.A.S.T.
The easiest way to remember the warning signs is the word FAST:
- F — Face drooping. Ask the person to smile; one side may sag.
- A — Arm weakness. Ask them to raise both arms; one may drift down.
- S — Speech difficulty. Speech may be slurred or hard to understand.
- T — Time to call 911. If you see any of these signs, call immediately and note the time symptoms started.
Other sudden symptoms to take seriously
Not every stroke fits neatly into FAST. Call 911 for any sudden numbness or weakness on one side of the body, confusion or trouble understanding speech, loss of vision in one or both eyes, a severe headache with no known cause, or trouble walking, dizziness, or loss of balance.
Why time is brain
Clot-dissolving treatment and clot-removal procedures work best within a narrow window after symptoms begin. The sooner blood flow is restored, the more brain tissue — and function — can be saved. That is why noting the exact time symptoms started matters so much to the emergency team.
What you can control
Many strokes are preventable. The largest modifiable risk factors are high blood pressure, diabetes, high cholesterol, atrial fibrillation, and smoking. Managing these together with your physician dramatically lowers your risk.
After a stroke or TIA
A "mini-stroke" (TIA) is a warning that should never be ignored — it signals a high risk of a larger stroke soon. After any stroke or TIA, a neurologist works to identify the cause, manage risk factors aggressively, and coordinate rehabilitation so you recover as fully as possible.
This article is for general education and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified physician with any questions about a medical condition. If you think you may have a medical emergency, call 911.
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