There are many patients with cerebral infarction who do not necessarily have high blood pressure, mainly in the following cases, no cerebral infarction can also cause high blood pressure: First, coronary heart disease myocardial infarction, wind heart disease, long-term arrhythmia, atrial fibrillation or heart valve surgery, it is easy to form a thrombus in the atrium, and after the thrombus is dislodged, it is easy to cause cerebral embolism caused by blockage of blood vessels in the brain. Secondly, if a hypotensive patient has high fever, insufficient food or a large amount of diarrhea caused by insufficient blood volume, it is also easy to cause a decrease in blood pressure and a sudden cerebral infarction. Third, for young female patients, if they are taking oral contraceptives for a long time, it can also cause changes in blood viscosity and blood stagnation and cerebral infarction. The above three cases are all patients without hypertension have a cerebral infarction.