Cerebral infarction is also known as ischemic stroke, the diagnosis of ischemic stroke usually needs to be combined with clinical manifestations and auxiliary examinations (such as CT, magnetic resonance, etc.), self-testing is not very reliable, but still has a certain value. The clinical manifestations of ischemic stroke vary according to the size and location of the infarct. Some patients may have prodromal symptoms (such as limb numbness, weakness, etc.) before the onset of the disease, and should be alert to the possibility of cerebral infarction when such symptoms occur. Common symptoms of cerebral infarction include blindness or impaired visual field (unilateral), hemiparesis, aphasia or impaired speech, facial paralysis, incontinence, and personality changes. Cerebral infarction should also be considered when these symptoms suddenly appear. Remember the BE FAST mnemonic: B is for “balance”, E is for “eyes”, F is for “face”, A is for “arms”, and S is for “speech”. F is for “face”, A is for “arm”, S is for “speech” and T is for “time”. Early treatment of cerebral infarction is very important. Early treatment can save the brain that has been damaged but not yet inactivated, and save brain function as much as possible. Therefore, once suspicious symptoms appear, we should consult a doctor immediately, improve auxiliary examinations to make a clear diagnosis, and actively treat the disease in order to reap the best therapeutic effect.