Varicose Veins (Chronic Venous Insufficiency)

Varicose Veins (Chronic Venous Insufficiency)

Venous return from the leg works against gravity, and it does so without a pump of its own. Blood is moved upward by the contraction of calf muscle surrounding the deep veins, and it is held against backflow by bicuspid valves spaced along the vessel. Varicose veins arise when that system fails: valve incompetence permits reflux, the column of blood above transmits its full hydrostatic pressure downward, and the vein wall dilates under a load it was not built to carry. Dilation separates the valve leaflets further, which worsens the reflux, so the process is self-reinforcing once established. Between 20 and 30 percent of adults are affected, with women outnumbering men by roughly two to one.

The symptoms follow the same hydrostatic logic. Leg heaviness and aching, swelling, itching and cramps characteristically worsen through the day and with prolonged standing, and improve with elevation, because elevation removes the pressure column that produces them. Visible dilated veins are the sign the condition is named for, but they correlate poorly with symptom severity: prominent veins may be comfortable, while a leg with modest visible change may ache considerably. Skin discolouration marks a later stage, in which sustained venous hypertension drives red cell extravasation and haemosiderin deposition in the skin of the lower leg.

The listed risk factors map onto the mechanism directly. Prolonged standing maintains the pressure column for hours at a time. Obesity raises intra-abdominal pressure, impeding venous return at the pelvic level. Pregnancy contributes through two routes at once, mechanical compression by the gravid uterus and progesterone-mediated relaxation of the vein wall, which is why varicosities often appear in the first pregnancy and may partially regress afterward. Female sex, family history and ageing reflect the connective-tissue and valve characteristics of the vein wall itself. Previous deep vein thrombosis constitutes a distinct pathway, since valve damage from a resolved clot produces secondary insufficiency in a vein that was previously competent.

The non-supplement measures that address this condition are mechanical, and their rationale is transparent: graduated compression opposes the hydrostatic pressure externally, elevation removes it, and calf muscle activity restores the pump. Interventional options address the refluxing segment itself.