Most varicose vein issues are hereditary. If you have one parent with varicose veins your risk of having them is around 65%. If both parents are affected the risk rises to approximately 90%. Another main risk factor for women is pregnancy, with the risk increasing with each additional pregnancy. Standing occupations such as hairdressers, nurses, and chefs also have a high risk of varicose veins as gravity puts pressure on the veins and weakens them.