Late one night not long ago, a friend from overseas called urgently, saying that his mother had a sudden onset of hemiplegia two hours ago in her hometown and had been sent to the local hospital with a normal CT, which did not show brain hemorrhage and was diagnosed as a stroke (cerebral infarction), and since it was within 3 hours of the onset, I urged him to use thrombolytic therapy quickly. However, due to various reasons, they still missed the best time for treatment until the end, causing serious sequelae that I regret. Because I know that if he could have received the right treatment within three hours, his mom might have been fine. By now, you should know that early recognition of stroke by family members is crucial, and that a patient with an ischemic stroke could have had a completely different outcome if he or she had received treatment within three hours. I am here to tell you the basics of recognizing a stroke. I hope you can take this knowledge to heart, but if you can’t, you can keep this information in your phone for emergencies. If you notice that someone around you is suddenly not feeling right, you can make a basic judgment about whether to call “120” immediately by asking him/her to complete the following four actions. These four requirements are: “say, laugh, stick out your tongue and make a face, and raise your hands in surrender”. ”Say”: Ask him to say a simple sentence (for example: how is the weather today, what is the number of today, you were there yesterday) “Smile”: Ask him to smile a little, pay attention to the symmetry of his face. ”Stick out your tongue and make a face”: notice if his tongue is off to the side. ”Raise your hands in surrender”: notice if his hands are raised at the same height and speed. Any one of the above four actions is problematic, please do not hesitate to call 120 emergency immediately! The ending may be completely different.