1.Sudden onset of numbness and weakness of one side of the face or limb, crooked and salivating mouth; 2.Sudden onset of blurred vision or blindness; 3.Sudden onset of difficulty in language expression or understanding; 4.Sudden onset of severe unexplained headache or vomiting; 5.Sudden onset of unexplained dizziness, unsteady walking or sudden fall, forgetfulness or memory impairment, especially if accompanied by any of the symptoms 1-4. Early symptoms of stroke (cerebral infarction or cerebral hemorrhage) should be sought promptly regardless of the duration to shorten the delay before hospital admission and delay treatment.