Sclerotherapy injects a solution into the dilated vein that irritates its wall so it closes and is gradually absorbed by the body. Liquid is used for spider veins and foam for larger veins under ultrasound guidance. No anaesthetic is needed, sessions are short, and patients return to activity the same day.
Sclerotherapy is one of the oldest varicose vein treatments and also one of the most refined. Today it treats fine spider veins and, with foam technique, larger veins precisely under ultrasound.
How does it work?
A sclerosant is injected into the vein, irritating its inner lining so the walls stick together and close. Over weeks the body gradually absorbs the closed vein.
Liquid or foam?
- Liquid: for spider veins and very small veins.
- Foam: the agent is mixed with air to form a foam that displaces blood and contacts more of the vein wall, suiting medium varicose veins, branches and recurrent veins after previous surgery. It is usually injected under ultrasound guidance.
Who is it for?
- Spider and reticular veins.
- Side-branch varicose veins after closing the main vein with laser or radiofrequency.
- Recurrent varicose veins and some venous ulcers.
- Some venous vascular malformations.
Who should avoid it?
Pregnant or breastfeeding women, people with a current clot or a history of clots with certain risk factors, some congenital heart conditions, and anyone allergic to the agent. The doctor decides after history and examination.
The session
- No anaesthetic needed; it usually takes 15 to 30 minutes.
- Very fine needles; it feels like a small prick.
- Compression stockings go on straight afterwards.
Aftercare
- Walk for half an hour after the session, then daily.
- Compression stockings for the period your doctor sets.
- Avoid hot baths, saunas, direct sun and strenuous exercise for a few days.
- Mild bruising or a firm cord along the vein is expected and fades gradually.
How many sessions?
It depends on the number and size of veins. Spider veins may need one to three sessions a few weeks apart, and the final result shows over weeks to months.
Frequently asked questions
Is sclerotherapy painful?
It feels like a fine needle prick, needs no anaesthetic, and most patients tolerate it easily.
When do veins disappear after injection?
They start to fade within weeks, and the final result appears over weeks to months depending on vein size.
Can I go back to work afterwards?
Yes, usually the same day, wearing compression stockings and walking regularly.
Content on this website is for awareness only and does not replace a specialist medical examination.