Spider veins are small, red or purple blood vessels that are twisted or turned. They are more commonly visible on the face and legs. There are many reasons for the condition such as standing for long hours, hormonal changes in the body during puberty, pregnancy, and menopause, obesity, the use of birth control pills, and a history of blood clots. Spider veins are more common in women, and they develop with aging. Many patients have described the condition as aching or cramping in the legs. The most common symptoms include tingling, throbbing, burning or a feeling of heaviness in the legs. Spider veins don't pose a serious health risk other than being a cosmetic issue for most sufferers.