Can excercise cause varicus vains?

No: Exercise helps circulation. Varicose veins are often genetically predisposed, more common in women, and aggravated by pregnancy and prolonged standing. Support hose is highly recommended. Thin, and in fashionable colors, the many featured hosiery is commercially available everywhere.

Yes and no: Exercise is a double edged sword. High impact exercise such as jogging or running on a treadmill can cause constant jarring of the vein valves which could lead theoretically to incompetence of them. Other forms of exercise such as biking, swimming and elliptical is good for the veins by increasing the venous return and muscle contractions without injuring the valves. See a vein specialist.