Because there is no way to tell [in the short term] whether symptoms are from a TIA or an acute stroke, patients should assume that all stroke-like symptoms signal an emergency and should not wait to see if they go away,  -   National Institute     Quotes
Because there is no way to tell [in the short term] whether symptoms are from a TIA or an acute stroke, patients should assume that all stroke-like symptoms signal an emergency and should not wait to see if they go away, National Institute