Why Varicose Veins Come Back After Treatment — and How Recurrence Is Prevented

Veins reappearing a year or two after treatment is one of the most demoralising things a patient can experience, and it is usually interpreted as the procedure having failed. In most cases the procedure did what it was meant to do — the source that was feeding the veins was never fully identified.

Reason one: an untreated source above

Surface veins are the visible end of a pressure problem that starts higher up. If the great or small saphenous vein was treated but a refluxing anterior accessory vein, perforator or pelvic vein was not, pressure simply finds the next route down. In women, reflux in the pelvic and ovarian veins is a recognised contributor, and it is the reason veins that recur around the vulva, buttock or inner thigh deserve a pelvic assessment rather than another round of surface injections.

Reason two: neovascularisation and new reflux

After surgery in the groin, small new vessels can grow across the operated area and reconnect the superficial system to the deep veins. Separately, valves in previously normal veins can fail over the following years — this is new disease rather than recurrence, but it looks identical to the patient.

Reason three: incomplete initial assessment

A scan done lying down, or done only over the visible veins rather than mapping the whole limb, misses reflux. A full assessment scans standing, tests reflux at each junction, follows perforators, and confirms the deep veins are patent. Where recurrence has already happened, this mapping is the entire job of the second consultation.

Reason four: the underlying tendency has not gone away

• Occupations with long standing hours — theatre staff, teachers, security personnel, retail and hospitality workers.
• Subsequent pregnancies, which raise pelvic venous pressure again.
• Weight gain, which increases abdominal pressure and reduces venous return.
• Family history — the strongest single predictor of both first-time and recurrent varicose veins.

What a reassessment should include

A useful second opinion for recurrent veins is largely a scanning exercise. Expect a standing duplex study of both limbs, specific interrogation of the previously treated segments, a search for perforators and accessory veins, and — where the pattern fits — imaging of the pelvic veins. The findings should be shown to you on the screen, with the specific source of the recurrence named.

Only then does the treatment discussion make sense: targeted ablation of a missed trunk, foam sclerotherapy for a network fed by a perforator, embolization where pelvic reflux is driving the limb, or in some cases compression alone if the recurrence is cosmetic and the deep system is doing important work.

Preventing a second recurrence

Treat the source, not the appearance; complete the treatment in a planned sequence rather than piecemeal; and review with a scan rather than by eye. Most patients who have been through one recurrence and then had a properly mapped reassessment do not go through it a third time.

If you have already been offered another procedure

It is entirely reasonable to ask which specific vein is the source this time, and to see it on the scan. If that question cannot be answered clearly, a second opinion before agreeing to treatment is the sensible step — bring your previous operation notes and any earlier scan images with you.