Compression socks during pregnancy: swelling, fit, and safety

What does the evidence say about compression socks during pregnancy?

1. A pregnancy trial used knee-length 20 to 30 mmHg stockings for about eight hours daily and found smaller increases in calf and ankle measurements than in controls. 1
2. A late-pregnancy study reported changes in leg edema measures and deep venous flow after elastic stocking use, but it was small and short. 2
3. A Cochrane review found very low-certainty evidence about compression stockings for venous clot-risk reduction in pregnancy, leaving the benefit uncertain. 3
4. A review of pregnancy venous conditions describes stockings as an option for swelling and post-thrombotic symptoms, with fit and clinical context affecting use. 4
5. Compression socks do not explain the cause of new one-sided swelling or pain, and symptom evaluation should not be delayed while choosing a sock. 4

Is compression socks safe in each trimester?

• First trimester. For mild swelling in the first trimester, ask whether compression is needed and check that the sock does not pinch, numb, or change skin color.
• Second trimester. During the second trimester, putting a correctly fitted sock on before prolonged standing may help comfort. Your clinician should select pressure if you have vascular disease or unusual swelling.
• Third trimester. Swelling is common later in pregnancy, but new one-sided leg swelling, pain, or warmth needs urgent assessment. Chest pain or sudden shortness of breath needs emergency care. Do not wait to see whether compression socks help.