If the blood pressure is low, there are usually the following factors: 1, there are some primary factors that lead to low pressure, such as genetic factors, or when the patient has a thin body type, poor nutrition, and low immunity, etc. 2, if there are other causes of secondary low pressure, including the rapid emergence of shock in a short period of time, such as hemorrhagic shock, infectious shock, or anaphylactic shock, these causes will lead to low pressure, 3, some endocrine metabolic factors, such as hypothyroidism, adrenal insufficiency, will also appear low blood pressure. 4, patients in heart disease, such as chronic heart failure will also have low pressure situation.