The best time for thrombolysis in cerebral infarction is currently within 4.5 hours of onset, and thrombolytic therapy taken within this time can lead to revascularization, reduce the disability rate and improve the quality of survival. The duration of the warning symptoms of stroke may be as short as a few seconds, but regardless of the duration, as long as the following symptoms occur, you should seek medical attention promptly and strive for thrombolytic therapy if possible 1. sudden numbness or weakness of one side of the face or limb; 2. sudden blurred vision or blindness, especially unilateral; 3. aphasia, difficulty speaking or understanding language; 4. sudden severe headache of unknown origin; 5. unexplained dizziness, unsteady walking or sudden falls, especially if accompanied by any of the above symptoms.