Per CDC:
TIAs are sometimes known as “warning strokes.” It is important to know that

A TIA is a warning sign of a future stroke.
A TIA is a medical emergency, just like a major stroke.
Strokes and TIAs require emergency care. Call 9-1-1 right away if you feel signs of a stroke or see symptoms in someone around you.
There is no way to know in the beginning whether symptoms are from a TIA or from a major type of stroke.
Like ischemic strokes, blood clots often cause TIAs.
More than a third of people who have a TIA and don’t get treatment have a major stroke within 1 year. As many as 10% to 15% of people will have a major stroke within 3 months of a TIA.1

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