According to the American Society for Dermatologic Surgery, around 40% of women have unsightly veins, including spider veins. It is unknown what exactly causes spider veins, although aging, hormonal changes, heredity, trauma, pregnancy, and sun damage are recognized as primary contributing factors. The number of women with this condition is slightly higher than of men.
Spider veins smaller than varicose veins, and are twisty and elongated. Although these are often cosmetic issues, spider veins can also be indications of a more serious health problem.