Pregnancy does not cause varicose veins, but if you have the underlying valve problem, they may become more visible during pregnancy. However, they would have come anyway sooner or later. This is true for 98% of all women.
HOWEVER – there is a special group of patients who DO get varicose veins because of pregnancy. These are called “ovarian” or “pelvic” vein reflux and typically cause Vulval Varicose Veins or varicose veins of the Upper Inner Thigh or spreading over the backs of the legs at the top of the thigh.