There is no such thing as “the most dangerous day of a brainstem infarction”. The first week after a brainstem infarction is a dangerous period. This period is the peak of cerebral edema, if not treated in time, the infarction area will expand, the patient will have choking on water, swallowing difficulties, etc., which can lead to serious consciousness disorders and even death. One week after the brain stem infarction is more dangerous, at this time should be given aspirin, clopidogrel and other anti-platelet aggregation; atorvastatin, resuvastatin and other stabilization of plaque; edaravone and other brain protection, scavenging of free radicals. If not treated in time, the area of infarction becomes larger, and the patient will experience dizziness, choking on drinking water, difficulty in swallowing and other symptoms, and some patients will experience drowsiness, lethargy, coma, and in severe cases, life-threatening. After the occurrence of brainstem infarction, should immediately go to the hospital for consultation and treatment. Medications should be used under the direction of a doctor.