If someone is having these symptoms right now, stop reading and call 911.
Use the FAST check while you wait, and take thirty seconds to do it properly:
- F — Face. Ask them to smile. Does one side droop?
- A — Arms. Ask them to raise both arms and hold them up. Does one drift down?
- S — Speech. Ask them to repeat a simple sentence. Is it slurred, or are the words wrong?
- T — Time. Any one of these — call 911. Note the time symptoms started. That single detail shapes every treatment decision at the hospital.
Call an ambulance rather than driving. Not because driving is slower, but because the paramedics begin the assessment in the vehicle and alert the stroke team before you arrive — which can save an hour of hospital time. And symptoms that vanish are not a reason to stand down. Go anyway. The rest of this page explains why that matters more than almost anything else you’ll read today.
The Most Dangerous Word Is “Mini”
Someone’s arm goes weak at breakfast. Words come out wrong for a minute. A cup slips. Ten minutes later everything is completely normal, and everyone at the table decides it was tiredness, or a pinched nerve, or nothing.
A transient ischemic attack — a TIA, a “mini stroke” — is a brief interruption of blood flow to part of the brain. The blockage clears on its own. The symptoms disappear. And that recovery is precisely what makes it lethal, because it produces a feeling of relief exactly when the situation is most dangerous.
Here is what the research actually shows. After a TIA, the risk of a full stroke over the next 90 days runs somewhere around 10 to 20 percent — and roughly half of that risk lands in the first 48 hours. Not spread out over three months. Concentrated in the two days when almost everyone decides to wait and see.
Then there’s the number that should be on every fridge in the country. The EXPRESS study out of Oxford compared people assessed and treated urgently against people who went through the usual route and waited about three weeks. The 90-day stroke rate fell from 10.3 percent to 2.1 percent — an 80 percent reduction. Same patients. Same treatments. The only variable was how fast they started.
That’s the entire article in one sentence: the symptoms went away, and you have about two days to act on a warning that most people throw away.
“No Lasting Damage” Is Often Untrue
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There’s a widespread belief that a TIA leaves nothing behind. That belief is outdated.
The old definition — symptoms lasting under 24 hours — was abandoned by neurologists years ago, because MRI showed it was wrong. When people diagnosed with a TIA are scanned with diffusion-weighted MRI, somewhere between 30 and 50 percent turn out to have a small area of dead brain tissue. If symptoms lasted longer than half an hour, that figure climbs past 60 percent.
Which means a meaningful share of “mini strokes” weren’t mini at all. They were strokes. Small ones, in a spot that didn’t produce permanent obvious symptoms — but real, permanent, and visible on a scan. The brain simply routed around it.
What They’re Actually Looking For
This is why the workup matters, and it’s the part worth understanding before you go.
A TIA is not a disease. It’s a symptom — evidence that something upstream is throwing clots or restricting flow, and that something is still there after the symptoms stop. The emergency room’s job is to find it.
The most important thing they hunt for is atrial fibrillation — an irregular heart rhythm that lets blood pool in the upper chamber and form clots that travel to the brain. AFib is common, often completely symptomless, and it’s found for the first time in a substantial number of stroke and TIA workups. It matters enormously because it’s one of the most preventable causes of stroke in medicine: anticoagulant medication cuts the stroke risk from AFib by roughly two-thirds. Some people leave the hospital on a drug that removes most of their stroke risk for the rest of their life — a risk they had no idea they were carrying that morning.
They’ll also check the carotid arteries in the neck for narrowing, since a significantly blocked carotid can be surgically cleared, and the benefit is highest when it’s done within about two weeks. Plus blood pressure, cholesterol, blood sugar, and a heart monitor to catch a rhythm that only misbehaves intermittently.
None of this is available to someone sitting at home deciding it was probably nothing.
The symptoms below are the ones that get dismissed most often — and two of them are almost never connected to the brain at all, which is exactly why they get missed.
