What causes spider veins, and how are they treated?

Spider veins are small, visible blood vessels that appear close to the surface of the skin, most commonly on the legs. They may appear red, blue, or purple, often in a branching or web-like pattern.

They develop when blood flow through superficial veins becomes less efficient. When blood doesn’t circulate smoothly, this can lead to dilation and increased visibility over time.

Several factors can contribute to this process. Genetics often plays a significant role, as does hormonal change, including pregnancy or menopause. Occupations or routines that involve prolonged standing or sitting may also influence how these veins develop. Over time, natural changes in circulation and vascular integrity can further contribute.

For many patients, spider veins and other visible leg veins are primarily a cosmetic concern. In some cases, they may also be associated with mild symptoms such as heaviness or aching in the legs.

Are spider veins the same as varicose veins?

Spider veins and varicose veins are often discussed together, but they are distinct.

Spider veins are smaller, more superficial, and typically flat against the skin. Varicose veins are larger, may appear raised or bulging, and are often associated with deeper changes in venous function.

While spider veins are usually a cosmetic concern, varicose veins may be associated with more noticeable symptoms, including aching, heaviness, or swelling in the legs.

This distinction is important, as it helps guide appropriate treatment. Sclerotherapy is most commonly used for spider veins and smaller superficial veins. Larger varicose veins may require a different type of medical evaluation or treatment approach.

When should you treat spider veins?

Not all spider veins require treatment. Many patients choose to address them when they become more noticeable or begin to affect how they feel about the appearance of their skin.

It can also be reasonable to seek assessment if the veins are increasing over time, or if they are accompanied by symptoms such as persistent aching or a sense of heaviness in the legs.

A consultation allows for a more complete understanding of what is contributing to these changes, and whether treatment is appropriate.

How does sclerotherapy treat spider veins?

Sclerotherapy is a well-established, evidence-based, non-surgical vein treatment that directly targets spider veins and other small visible veins on the legs. A medical solution is injected into the vessel, which irritates the inner lining and causes it to collapse. Over time, the body gradually reabsorbs the treated vein, and blood flow is redirected to surrounding healthy vessels. This process leads to a reduction in the visibility of the vein and a more even appearance of the skin.

It is important for patients to understand that sclerotherapy treats existing veins, but it does not prevent new ones from forming. In patients with an underlying predisposition, maintenance treatments may be part of a longer-term plan.

What results can you expect from sclerotherapy?

Results develop gradually. Treated veins typically begin to fade over the course of several weeks, with continued improvement over time.

Most patients require more than one treatment session, particularly when multiple or more established veins are present. Sclerotherapy is one of the most commonly used treatments for spider veins on the legs, and when performed appropriately, can lead to a meaningful and natural-looking improvement.

The goal is not absolute perfection, but a visible reduction in spider veins that supports overall skin clarity.

Can spider veins be prevented?

Spider veins cannot always be prevented, particularly when there is a strong genetic or hormonal component. However, certain habits may support overall vascular health and help reduce progression over time.

Regular movement, particularly for those who sit or stand for extended periods, can support circulation. In some cases, compression therapy may be recommended. Maintaining a stable weight and protecting the skin from sun exposure may also play a role in long-term skin health.

These measures are supportive, but they do not replace treatment for veins that have already developed.

Is sclerotherapy right for you?

The most appropriate approach begins with a consultation. This allows for an assessment of the type of veins present, an understanding of your goals, and a discussion of what treatment can realistically achieve.

For many patients, sclerotherapy offers a safe and effective option for treating spider veins. In other cases, further evaluation or an alternative approach may be recommended to ensure the best outcome.