Veins are the tubes in the cardiovascular system that guide and carry blood back to the heart. Veins begin in the capillaries and terminate in the atria. Small veins begin in the capillaries and gradually merge into medium and large veins during the return process to the heart and finally into the atria. The venous valves in the venous vessels are damaged and do not close properly, resulting in a continuous flow of blood from the venous vessels. 1.Congenital causes Patients may be born with some small problems in their valves, and with the acquired pressure, varicose veins are formed; 2.Vascular problems People who have suffered from venous embolism, the valve function may be damaged; 3.Perforation failure The perforated vein, which connects the superficial vein with the deep vein, also has a valve to prevent blood from the deep vein to the superficial vein, however, when the function of the perforated vein valve becomes problematic, the blood will flow freely to the superficial vein. However, when the perforated vein valves fail to function, the blood flows at will, putting pressure on the superficial veins and dilating them. One is to take good care of the disease in a healthy way to slow down the progression of the disease. The second is surgical treatment, which is performed when the disease is so severe that it affects the life (there are certain risks and it is usually the last option). The third is medication. At present, the more respected medication is the use of 3500 mg of high-dose 3-hydroxyethyl rutin treatment, both Furetrex rutin granules, which, too, is approved by the National Drug Agency.