Sclerotherapy for Thread Veins

Thread vein treatment is one of our most commonly requested procedures. At The Vein Clinic, we offer sclerotherapy as an established treatment option for suitable thread veins on the legs, following specialist assessment

Sclerotherapy is a minimally invasive outpatient procedure in which a sclerosant solution is injected into targeted veins using a very fine needle. Treatment sessions are typically short and performed without the need for local anaesthetic.

Not all visible veins are suitable for immediate sclerotherapy. In some patients, underlying venous reflux or varicose veins must be identified and treated first to achieve durable results. A specialist assessment ensures the most appropriate treatment pathway is recommended.

Frequently asked questions about thread vein treatment

Patients often ask similar questions before deciding whether to proceed with sclerotherapy. The answers below address the most common concerns we hear in clinic.

What are thread or spider veins and are they the same as varicose veins?

Thread veins, also known as spider veins, are small red, blue or purple veins that lie close to the surface of the skin. They most commonly appear on the legs but can also occur on the face. They are not dangerous but may cause aching, itching and cosmetic concern.

Thread veins are not the same as varicose veins. Varicose veins are larger, deeper veins and are often associated with underlying venous reflux. Treating any underlying vein problem first is important, as untreated reflux can cause thread veins to recur.

What is the best treatment for thread veins on the legs?

For thread veins on the legs, microsclerotherapy is widely regarded as the most effective treatment. A sclerosant solution is injected into the vein using a very fine needle, causing the vein to close and gradually fade over time.

Most patients require 2–4 treatment sessions, depending on the extent of their veins. A specialist assessment is essential, as some patients may need treatment of underlying varicose veins before sclerotherapy is appropriate.

Does sclerotherapy hurt and what does it feel like afterwards?

Most patients describe only a brief stinging or burning sensation during injection, lasting a few seconds. Local anaesthetic is not required.

After treatment, mild aching, itching or tenderness can occur and usually settles within a few days. These sensations are commonly discussed online and are considered a normal part of the healing process.

Will my legs look worse before they look better?

Yes — this is very common and often causes concern. Treated veins may initially appear red, bruised, darker or slightly lumpy, and the skin can feel tender.

These changes usually improve over several weeks. Final results continue to develop over several months, as the treated veins are gradually absorbed by the body.

How many sessions will I need — and how long do results last?

The number of sessions depends on the severity of the thread veins; mild cases often need 1–2 sessions whilst, typical cases require 2–4 sessions. More extensive veins may need additional treatments

Treated veins do not reopen. However, new thread veins can develop over time, particularly if there is an underlying tendency or untreated venous reflux. Maintenance treatment may be required in the future.

Can thread veins come back after treatment?

The treated veins themselves do not return. However, new thread veins can appear over time. This reflects the progressive nature of venous disease, rather than treatment failure.

Addressing underlying vein problems reduces the risk of recurrence and improves long‑term results.

Is sclerotherapy safe and are there areas it should not be used?

Sclerotherapy has been used safely for many decades. Common side effects include bruising, itching and temporary skin staining. Rare complications include allergic reactions or persistent pigmentation.

Sclerotherapy must not be used on veins of the face or hands, where results are unpredictable and complications can be serious. Laser or light‑based treatments are safer and more effective for facial thread veins.

Do I need to wear compression stockings after treatment?

Yes. Compression helps the treated veins close properly and reduces bruising. Stockings are worn continuously for the first 24 hours, then during the day for 1–2 weeks, or longer for larger veins.

Is thread vein treatment covered by insurance?

No. Thread vein treatment is classified as cosmetic, even when symptoms such as aching or itching are present, and is not covered by insurance.

Thread veins should not be treated in the presence of untreated varicose veins. Increased venous pressure from underlying vein disease can prevent successful closure of fine thread veins and may lead to worsening appearance if treated prematurely. For this reason, a full duplex ultrasound assessment is essential before starting treatment, as not all varicose veins are visible on examination alone. A simple handheld ultrasound test is not sufficient for this purpose.

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