Hormonal influence in the development of venous disorders is well-documented. During pregnancy, 60-70% of women develop spider and/or varicose veins. These veins are the results of hormonal changes, as well as physical changes due to the growing uterus and an increase in volume of circulating blood during pregnancy. Although most of these veins disappear within 6 weeks after delivery, pregnant women should wear compression stockings to encourage healthy blood flow.
Birth control pills and hormone replacement therapy can also contribute to the development of varicose veins and spider veins. Speak to your doctor if you have a family history of vein problems, family history of thrombosis, or any signs of troubled veins.