(HealthDayNews) -- Strokes can begin with little warning and can be deadly without quick action. There are medications that can stop a stroke in its tracks, but they need to be taken within three hours of symptoms starting.

According to the University of California, Davis, warning signs of a stroke include:

• Sudden blurred or decreased vision, possibly only in one eye.
• Sudden weakness in any part of the body.
• Difficulty speaking or understanding conversation.
• Sudden intense headache.

If you experience any of these symptoms, call 911 without delay.