Being female (women are more affected by varicose veins than men, possibly because female hormones make the walls of veins relax more and the valves more prone to leaking).Family history (a genetic predisposition).Risk factorsĪ number of factors contribute to the development of varicose veins. However, they can occur in other areas of the body (such as haemorrhoids, which are varicose veins in the anus or rectal area). The superficial veins in the legs are the most common place for varicose veins to occur – due mainly to problems with vein junctions (where different veins join together) in the upper thigh, behind the knee, and in the calf muscle. Varicose veins appear under the skin as bluish-green lines, which may bulge out or appear twisted and contorted. The blood pools in the area below the affected valve causing the vein to enlarge and stretch. Varicose veins occur when the valves within the veins stop working properly and allow blood to backflow.
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