The main causes of hemorrhoids in women are pregnancy, chronic constipation and prolonged sitting. Specific analysis is as follows: 1. pregnancy: after pregnancy, due to the uterus enlargement, can lead to intra-abdominal pressure and anal vein pressure increases. And due to the venous blood reflux obstruction, not smooth, resulting in perianal varicose veins into a mass, you can form hemorrhoids. 2. Long-term constipation: constipation due to dry stool is not easy to discharge, may cause perianal vein blood return is not smooth, resulting in varicose veins into a mass, the formation of hemorrhoids. 3. Long-term sedentary: long-term sedentary can affect the venous blood circulation, resulting in hemorrhoidal veins overfilling, bruising, expansion, and then the formation of hemorrhoids. To sum up, the causes of hemorrhoids are multi-faceted, so in daily life should pay attention to the dietary laws, more intake of vegetables and fruits rich in dietary fiber, drink more water, appropriate exercise, can prevent constipation. In addition, usually should avoid sitting for a long time, sit for an hour or two should get up and move around.