Stroke is a disease that is more likely to leave a disability that can be life-threatening in severe cases. There are many ways to prevent stroke, including ischemic stroke and hemorrhagic stroke, and there are many articles of this kind that you can easily find on the Internet. Once an ischemic stroke (cerebral infarction) occurs, unless thrombolysis can be performed within a limited period of time, other treatments are less effective, and at present, thrombolysis is the only method with definite efficacy that can make the patient gain maximum benefit or even complete recovery. However, thrombolysis has a very strict time limit, that is to say, it is effective only within 4.5 hours after the onset of the disease, and the best efficacy is around 3 hours, which requires people to have a common sense to determine whether a cerebral infarction has occurred, and once it occurs, they must go to a hospital with thrombolysis capability within the limited time. Generally, there are several common symptoms that need to be alerted as follows: 1. Sudden slurred speech, crooked mouth, or accompanied by unfavorable movement or numbness of one limb. The slurred speech and crooked mouth mentioned here do not refer to facial palsy. Facial palsy is usually accompanied by abnormal eye fissures when the mouth is crooked, i.e., there is incomplete eye closure without tongue inactivity, and facial palsy is still possible with tongue movement although the speech is leaky. 2. Hemiparesis of one limb, which is the most common symptom of cerebral infarction, pay attention to one limb instead of both limbs (it is rare to have bilateral limbs hemiparesis at the same time, special cerebral infarction will have both sides, but often accompanied by other symptoms). 3.Sudden unconsciousness or abnormal mental behavior, often accompanied by limited movement or numbness of one limb. 4, never before vertigo, vertigo unstable standing, tinnitus, deafness, accompanied by nausea and vomiting, can not walk in a straight line, will be accompanied by blurred vision or see objects double shadow, or accompanied by numbness of the limbs, or abnormal sweating, obvious nystagmus, this is a more serious part of the brain infarction, often posterior circulation infarction, this infarction is often fatal, without thrombolysis mortality is very high. Here it should be distinguished from the general vertigo, sometimes otolithic vertigo symptoms are also heavy, accompanied by nausea, vomiting, and also nystagmus, but the duration is short and often relieved in short time. The next step is how to judge the time when brain infarction occurs. It is easy to judge when it occurs during the day, but not easy to judge when it occurs at night, often waking up in the morning and finding that one side of the body cannot move. It is hoped that people can detect cerebral infarction early and send it to a hospital with thrombolytic ability early. In developed countries, the average time to perform thrombolysis is one hour from the time of arrival to the hospital, and the fastest time is 40 minutes, so it is best to send the patient to the hospital at least within 3 hours after the onset of the disease, plus the time in the hospital, so that thrombolysis can be performed within 4.5 hours. A patient with crooked mouth and slurred speech with hemiplegia on the left side of the body was brought to our department at 2:00 last night within 2 hours of onset. Without thrombolysis, the patient may be left with hemiplegic sequelae. I hope everyone better do a good job in stroke prevention, and once it happens must do a good job in timely consultation and thrombolysis as early as possible. I wish everyone a speedy recovery.