Puberty
When you get your first period, estrogen and progesterone levels rise dramatically. This causes the walls of veins to soften, which can cause them to stretch or bulge. This is true for all blood vessels, not just those in the legs, so there’s also a possibility that spider veins could develop on other parts of the body as well.
When thinking about puberty as a cause of spider veins, it’s important to remember that estrogen is not the only hormone that plays an important role in this process. Progesterone increases with age and is involved in softening the veins’ walls. However, estrogen is the primary cause because it is involved in both menstruation and menopause. Still, progesterone must also be considered when discussing puberty as a cause of spider veins.
