The causes of hypotension are physiological hypotension, pathological hypotension, and pathological blood pressure is subdivided into primary hypotension and secondary hypotension. In physiological hypotension, most healthy people may have systolic blood pressure below 90 mmHg and diastolic blood pressure below 60 mmHg, but they do not feel abnormal symptoms and after long-term follow-up, the patients do not have ischemia or hypoxia in the organs of the human system except for low blood pressure, and it does not affect the life expectancy of the patients. Pathological hypotension is divided into primary hypotension and secondary hypotension, in general, primary hypotension, the impact on people, not too obvious, such as physical hypotension, mostly seen in the elderly, women with a thin physique. There are also some secondary hypotension, such as hemorrhage, acute myocardial infarction, infection, severe trauma, and anaphylactic shock, etc., can lead to a sharp decrease in blood pressure, and their danger is still very great. The patient should first determine the cause of the hypotension. Patients with hypotension should first determine the cause and then consider the specific treatment.