Why Are Varicose Veins More Common in Women?
Women are more likely than men to develop varicose veins. Although genetics remains the strongest overall risk factor, hormonal changes throughout a woman's life — during the menstrual cycle, pregnancy and menopause — can affect the veins and increase the likelihood of developing chronic venous disease.
Female Hormones
Female sex hormones, particularly progesterone, can relax the walls of the veins. While this is a normal physiological effect, it may reduce the efficiency of the one-way vein valves over time, making venous reflux more likely in susceptible individuals. Hormonal fluctuations during the menstrual cycle, pregnancy and menopause may also contribute to changes in the veins, although the degree of effect varies from person to person.
Pregnancy
Pregnancy is one of the most important reasons why women develop varicose veins. Increased blood volume, hormonal changes and pressure from the enlarging uterus all make it more difficult for blood to return from the legs to the heart. The risk generally increases with each pregnancy. Many women notice that varicose veins improve during the months after giving birth; however, veins that remain enlarged six to twelve months after pregnancy are less likely to disappear completely without treatment. For a full explanation of varicose veins during and after pregnancy, see the dedicated page on varicose veins and pregnancy.
Age and Longevity
Women generally live longer than men, and because varicose veins become more common with age, this also contributes to their higher lifetime prevalence.
Hormone Replacement Therapy and Oral Contraceptives
Many women ask whether hormone replacement therapy (HRT) or the oral contraceptive pill causes varicose veins. Current evidence does not show that either treatment directly causes varicose veins. However, because hormones can influence vein wall function, they may contribute to symptoms or disease progression in women who are already genetically predisposed. If you have concerns about hormonal medications, discuss them with your doctor rather than stopping treatment on your own.
Men Can Develop Varicose Veins Too
Although varicose veins are more common in women, they are by no means exclusively a female condition. Many men develop symptomatic varicose veins, particularly if they have a strong family history, have occupations involving prolonged standing, or have had a previous deep vein thrombosis. Regardless of gender, persistent leg aching, heaviness, swelling, skin changes or visible varicose veins should be assessed with a duplex ultrasound scan to determine whether venous reflux is present and whether treatment is appropriate.