Primary hypertension is mostly caused by genetic factors. Normally the walls of the blood vessels have good elasticity under normal conditions, but when the blood vessels are subjected to constant pressure, it will make the flow of blood difficult, leading to an increase in blood pressure. Clinically, a blood pressure value of more than 140/90mmhg is called hypertension, and the absence of a disease that can cause high blood pressure is called primary hypertension. Primary hypertension is mostly related to genes. For example, there is a gene that relates to the reabsorption of sodium by the kidneys, and when this gene changes abnormally it can cause an increase in blood pressure. Secondly, abnormalities in the brain and central nervous system that inhibit sympathetic excitation, and abnormalities in the cell membranes of vascular smooth muscle cells are all related to genetic factors. After the development of primary hypertension, it is recommended to consult a cardiovascular physician for treatment under the supervision of a doctor.