Spider veins can be caused by a variety of factors, but the most common is veins that have become weak and are unable to prevent blood from flowing back into them. During the aging process, the venous system will often deteriorate making the appearance of spider veins more likely. Excess pressure on the veins due to pregnancy, obesity, or even long periods of standing and/or sitting can also play a role in their development.
In some cases, family history does play a role. If heart issues or clotting issues run in your family, you may be more affected. Trauma, exposure to the sun, and even changes in hormones (such as menopause) can result in the development of spider veins.
The appearance of spider veins can cause concern and embarrassment in some cases. However, there are ways to combat them.