The risk factors include age > 40 years, long time standing (23%), incompetent deep veins (17%), cancer (13.3%), pregnancy and the postpartum period (2.85%), protein C - protein S deficiency (7%), presence of acute infectious disease (3%), systematic disease (3%)... Edema, pain, tenderness, paresthesia, warmth and erythema, superficial dilatation vein of the legs are the common signs.