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Pregnancy Today's Health Advisory Panel Answers:
What exactly are varicose veins and what causes them?

by Shirley Moore
Certified Nurse-Midwife
Women's Health Specialists, Chicago
Shirley Moore

Question

I am 30 weeks pregnant and have developed varicose veins. My midwife has prescribed support hose for me and told me to wear them as much as possible. What causes varicose veins, and what exactly are they? Are there any negative consequences to going without the support hose occasionally? Do I need to wear them during and after giving birth? - Elizabeth, Minneapolis

Answer

Varicose veins occur due to a genetic predisposition to have weaker vessel walls; increased pressure in pregnancy due to increased blood volume and weight of the baby; and hormonal influence on the vessel wall that promotes greater relaxation in the vessel, lower blood return, and greater pooling in the lower extremities. If you have varicose veins, you are at increased risk for developing superficial or deep vein clots in pregnancy.

Wearing support hose helps to improve the blood return and decrease the risk of clotting. One important feature about wearing support hose is to be sure you put them on before you stand up and all the blood rushes to your lower extremities. When you shower or run to the bathroom in the morning before putting on your support hose, return to bed, lie down and place the soles of your feet against the wall higher than your head for five minutes. This will allow the blood to return to your trunk, then put your support hose on.

I encourage patients to see how the veins appear after having a baby. In the first few weeks of the postpartum period you will be at increased risk of clotting due to fluid volume and hormonal changes that will influence the elasticity of the vessel walls. You should discuss with your midwife if your varicosities are severe enough to require use of TED hose during labor or in the postpartum period.

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