The causes of varicose veins include congenital factors and acquired factors. The congenital factors include congenital weakness of the vein wall and insufficiency of the venous valve development, which are mostly related to genetic factors; the acquired factors are long standing, weight bearing, sedentary, chronic cough, pregnancy, etc. Prevention methods are as follows: 1, patients who need to stand for a long time can walk appropriately in the process of standing, which can reduce the pressure on the distal veins; 2, if they have a history of varicose veins in this kind of people, sit down to rest and elevate the lower limbs after an hour or so of activity; 3, for chronic cough and constipation, symptomatic treatment is needed; 4, sedentary patients can straighten both lower limbs and do foot dorsiflexion to promote venous reflux and slow down venous Dilation.