Are varicose veins and spider veins the same thing? While they are both caused by malfunctioning vein valves, varicose veins and spider veins have a different appearance as well as several other differentiating factors. Distinguishing between spider veins and varicose veins is simple once you know what to look for. Varicose Veins vs. Spider Veins: Similarities Varicose veins and...