Varicose veins are a very common problem. The precise aetiology of primary varicose veins remains unclear. It seems likely from the available evidence that inherited structural weakness combined with haemodynamic or microcirculatory abnormalities eventually lead to reduced vein wall elasticity, dilatation and the formation of varicosities. Increasing age, female gender, parity and occupation may all promote the development of varicose veins in susceptible individuals. Further clinical and experimental studies are necessary if the relative contribution of each of these factors is to be fully...