There are two different causes of both low and high pressure: 1. Physiological hypotension, also called primary hypotension, is related to genetic factors or a thin body type or low immunity in such patients. 2. If the patient belongs to secondary hypotension, it is usually caused secondary to a disease, such as hypotension and infection in a short period of time, whether it is bacterial, viral or other pathological microorganisms that infect the human body. 3. Other conditions such as hemorrhage, dehydration or severe allergies may also lead to a significant decrease in both low and high pressure. 4. 5, some congenital heart disease, chronic heart failure, cardiac insufficiency, there will also be low pressure, high pressure are low situation.