The truth about what causes spider veins: expert insights

“Is it because I wore heels too often?”

“Maybe it’s because I spend too much time sitting at my desk?”

“Did I do something wrong?”

These are some of the questions patients ask when they want to understand what causes spider veins. Before you start blaming yourself or falling into the trap of the many myths that circulate on this topic, it helps to pause and look at the facts. Because when it comes to spider vein causes, there is a lot of conflicting advice out there.

In this article, you will find out what actually causes spider veins, what you can and cannot control, and how modern treatments can help when the way they look starts bothering you more and more.

Table of contents

What are spider veins? Defining the condition

First things first. Why do we call them spider veins? Well, quite simply, because that is what they look like. These are tiny blood vessels that dilate and become visible just beneath the surface of the skin, forming fine, branching patterns that resemble a spider’s web. You may also hear them referred to as thread veins, which is another commonly used name, while their medical term is telangiectasia. They usually appear red, blue or purple, depending on the skin and the vessel involved. They stay flat against the skin and do not bulge outward (if that happens, you might be dealing with varicose veins).

From a medical perspective, spider veins are considered a cosmetic condition. They are not dangerous and, for the vast majority of people, they cause no physical symptoms whatsoever. That said, their impact on mental and psychological well-being should never be dismissed. When spider veins cause significant distress, when a patient starts avoiding social situations, choosing every outfit purely to cover their legs, that is a real and valid reason to do something about them. So, even if they may not be medically dangerous, wanting to feel comfortable in your skin again is a completely valid reason to address them.

Where do spider veins usually appear?

Spider veins most commonly appear on the legs and on the face, although they can develop in other areas too. On the legs, you might find them along the thighs, around the back or sides of the calves, near the knees, or down towards the ankles. Some are small and barely noticeable, others can spread across a wider area, forming a more extensive network of branching vessels. It is important to note that no matter what your particular case looks like, spider veins can be treated effectively.

On the face, spider veins tend to concentrate around the nose, cheeks, and chin. They often appear as fine red lines or a general diffuse redness in those areas. When it comes to treatment, the approach typically differs depending on location. For example, on the face, where the vessels are very fine and the skin is delicate, laser therapy or IPL (Intense Pulsed Light) are generally the preferred options, as they work without any injections and are well suited to sensitive areas.

The core factor: what causes spider veins?

Now, let us get to the question that brings most people to this article: what actually causes spider veins?

Spider veins are primarily a genetic condition. The predisposition to developing them is something you inherit. It is written into your biology before you make a single lifestyle choice. If your parents, grandparents, or other close relatives have spider veins or varicose veins, your own likelihood of developing them is higher. That said, having the genetic predisposition does not mean you will automatically develop spider veins. It simply means the potential is there. Some people carry the predisposition their entire lives and never develop visible veins.

Another important aspect you should know is that research shows that between a third and a half of patients presenting with spider veins have an underlying varicose vein condition that has not yet been identified. Varicose veins are a more serious medical condition that can lead to complications if left untreated, and in those cases, they should be addressed before any cosmetic treatment for the spider veins is carried out.

Did I do something wrong? Addressing the “lifestyle guilt”

If spider veins are already causing you psychological stress and discomfort, adding a layer of self-blame on top of that only makes things harder. It is not your fault that you have spider veins.

Yes, living an active lifestyle, moving regularly, and avoiding long sedentary periods is generally good advice for everyone. But that is very different from saying that sitting at your desk “gave” you spider veins. Or that heels caused spider veins. So if you have been mentally replaying routines and wondering whether this happened because of something you did, you can let go of that. The veins you are dealing with are, at their root, the result of a genetic predisposition. That is not something any of us get to choose. The most useful thing you can do now is seek an accurate assessment from a vein specialist, understand what you are working with, and decide how you would like to move forward.

How to treat spider veins effectively

When it comes to treating spider veins, two approaches are most commonly used by vein specialists: laser therapy and sclerotherapy.

Laser therapy

Laser therapy works by directing a focused beam of light energy at the spider vein. The light is absorbed by the blood vessel, generating heat that causes the vessel wall to break down and the vein to gradually fade and be absorbed by the body.

Microsclerotherapy

Microsclerotherapy is the most widely used treatment for spider veins on the legs. It involves injecting a tiny amount of a medical solution directly into the affected vein through an extremely fine needle. The solution irritates the inner lining of the vessel, causing it to collapse and close. Over the following weeks, the body absorbs the treated vein, and the skin gradually clears.

sclerotherapy spider veins
Final thoughts: managing your vein health

If the way your spider veins look is affecting how you feel, that is reason enough to do something about it. And if you are not sure whether what you have are spider veins or something more serious, a professional assessment will give you the clarity you need.

Schedule a consultation with Dr. Omar Abu-Bakr, a consultant vascular surgeon and phlebologist with over 18 years of experience treating spider veins and varicose veins. See before and after results to understand what a correctly performed treatment looks like in practice, and read what his patients say about their experience!

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