According to Marla Ahlgrimm, approximately 23 percent — roughly one in four adults — are affected by varicose veins. The majority of these are women.
Varicose veins are enlarged and swollen veins that usually occur on the feet and legs. They may be twisting or bulging and are sometimes lumpy. Varicose veins are often blue or dark purple in appearance, and are caused by interior valves that are weakened or damaged, Marla Ahlgrimm explains. These damaged valves fail to prevent blood from flowing backwards. This results in blood pooling in the vein, which causes it to become enlarged and swollen.