What is the main cause of varicose veins? : Spider or varicose veins can spoil the physical appearance. Therefore, it is necessary to eliminate them as they can cause serious discomfort in the future. Some varicose veins can cause serious health risks like blood clotting or pen sore on your legs. Visit a vein specialist to know what are the treatment options for varicose veins. The most recommended varicose veins treatments are sclerotherapy and laser treatments.