How Endovenous Laser Therapy (EVLT) Works: A Comprehensive Overview

Endovenous laser therapy (EVLT) treats varicose veins with laser energy delivered from inside the vein itself — no incision-heavy surgery, no hospital stay, and for most patients, no real downtime. It's become the preferred option for varicose veins caused by malfunctioning valves.

How it actually works

Varicose veins form when the valves inside a leg vein weaken, letting blood pool and the vein enlarge and bulge under the skin — a condition known as chronic venous insufficiency. EVLT addresses that directly: a thin laser fiber delivered into the vein heats its walls from the inside, causing them to collapse and seal shut. Blood already flowing through that vein reroutes through healthy veins nearby, and the sealed vein is gradually reabsorbed by the body over time.

What procedure day looks like

Before treatment, a consultation and duplex ultrasound assess the vein and confirm the treatment plan. On the day itself: the leg is cleaned and prepped, a local anesthetic numbs the area, and a catheter is guided into the vein through a small incision (usually near the knee) under ultrasound guidance. The laser fiber passes through the catheter and is activated as the physician slowly withdraws it, sealing the vein along its length — typically taking 20 to 60 minutes depending on how many veins are being treated. A compression bandage or stocking follows, and patients are encouraged to walk right away to support circulation.

Why it's replaced older techniques

• Minimally invasive — a small incision instead of the larger cuts traditional vein stripping required.
• Quick recovery — most patients return to normal activity, including work, within a day or two.
• Local anesthesia only — no general anesthesia or hospital stay required.
• High success rate — well-documented, consistent symptom relief across studies.
• Lower recurrence — addressing the malfunctioning vein directly, rather than just its visible symptoms, means a lower chance of the same vein causing problems again.

Who benefits most

Patients with heaviness, cramping, aching, or visible bulging from larger or moderate varicose veins — particularly those tied to venous reflux — tend to see the most benefit. Risk factors like prolonged standing, sedentary work, hormonal changes, genetics, or prior pregnancy all increase the likelihood of needing treatment. Smaller spider veins often need a complementary treatment like sclerotherapy alongside or instead of EVLT.

What recovery involves

Mild bruising or tenderness for a few days is typical and resolves quickly. Compression stockings are usually worn for one to two weeks, vigorous exercise and hot baths are avoided for several days, and walking is encouraged throughout. A follow-up appointment within a few weeks checks results and addresses any remaining concerns.