What Causes Spider Veins on the Legs, and What Actually Clears Them?

What causes spider veins on the legs?

Spider veins are small surface vessels that have weakened and widened enough to become visible. Several things make that more likely:

• Genetics. If spider veins run in your family, you are more prone to them. This is the single biggest factor for most people.
• Hormones. Pregnancy, menopause and the contraceptive pill all shift the hormones that affect vein walls, which is part of why spider veins are more common in women.
• Standing or sitting for long stretches. Long hours on your feet, or seated, raise the pressure in the leg veins over time.
• Ageing. Vein walls and the tiny valves within them lose some elasticity with the years.
• Sun and skin thinning. Sun exposure weakens the skin and the vessels close to its surface.
• Pressure and weight. Extra load on the legs adds to the pressure the surface veins carry.

If they seem to have appeared suddenly, it is usually that several of these factors lined up at once, often a hormonal shift or a long stretch on your feet, rather than anything new going wrong.

Sometimes surface spider veins lie above a deeper vein issue. If you also have larger, raised, aching veins, that is worth a separate look, which is covered in Spider Veins vs Varicose Veins.

Do leg spider veins go away on their own?

Mostly, no. Spider veins that appear during pregnancy sometimes fade in the months afterward, but the majority of established spider veins stay put once they have formed. On their own they are almost always harmless rather than a sign of something serious, so there is no need to treat them, but if they bother you, they will not generally clear themselves. The exception is when they appear alongside larger, raised or aching veins, which is the case worth having a doctor assess.

What actually clears them?

Two treatments do most of the clearing, and both are well established.

A vascular laser is absorbed by the blood inside the vessel, which heats and closes it. The body then clears the closed vessel over the following weeks. Pink uses a long-pulse Nd:YAG laser at 1064 nm for this, which suits fine surface veins and a broad range of skin tones, assessed clinically.

Sclerotherapy, the other main option, injects a solution that closes the vein from the inside. It is often described as the gold standard for leg spider veins. Laser has the advantage of treating fine vessels without needles, which suits people who would rather avoid injections, and for well-selected veins the outcomes are comparable. Which one fits your legs depends on the size and pattern of the veins, and a consultation is the honest way to decide.

Pink's laser approach, including pricing, is covered on the Laser Vein Removal page.

How many sessions, and will they come back?

Leg veins usually take more than one visit, and reticular veins, the slightly larger blue-green lines, take more time again. Pink prices vein treatment by the time a session takes rather than by counting vessels, and keeps each session to a comfortable length. The spacing between sessions is judged by your clinician on how the veins respond, not set to a fixed calendar.

As for recurrence: the tendency that produced your spider veins does not go away, so new vessels can appear over the years even after the current ones are cleared. Most people keep their legs clear with the occasional maintenance session. It is honest to expect upkeep rather than a single permanent fix.

Can I prevent new spider veins?

You cannot fully prevent them if the tendency is in your genes, but you can slow them down. Moving regularly rather than standing or sitting for hours, keeping the legs active, protecting your skin from sun, and using compression where a clinician advises it all help take pressure off the surface veins. These habits will not erase existing veins, but they give new ones less reason to form.

Frequently Asked Questions

What causes spider veins on the legs?

They form when small surface vessels weaken and widen enough to become visible. The main drivers are genetics, hormonal changes such as pregnancy and menopause, long hours standing or sitting, ageing, sun exposure and added pressure on the legs. Genetics is the biggest factor for most people.

Do leg spider veins go away on their own?

Usually not. Spider veins that appear in pregnancy sometimes fade afterward, but most established ones stay once formed. They are harmless, so treatment is a choice rather than a necessity, but they will not generally clear themselves.

How do you get rid of spider veins on the legs?

The two main treatments are vascular laser, which closes the vessel so the body clears it, and sclerotherapy, which injects a solution to close the vein. Both are well established. Laser treats fine vessels without needles; sclerotherapy is often used for leg spider veins. A consultation decides which suits your veins.

Is laser or sclerotherapy better for leg spider veins?

Both work well, and the choice depends on the size and pattern of the veins. Sclerotherapy is often described as the gold standard for leg spider veins, while laser treats fine vessels without injections and suits people who prefer to avoid needles. For well-selected veins the outcomes are comparable.

Will spider veins come back after treatment?

The treated veins are gone, but the underlying tendency to form surface veins remains, so new ones can appear over time. Most people maintain clear legs with the occasional top-up session, along with staying active and protecting the skin from sun.

Can I prevent spider veins?

Not entirely, especially if they run in your family, but you can reduce how readily new ones form. Regular movement, avoiding long unbroken periods of standing or sitting, sun protection, and compression where advised all help ease the pressure on the surface veins.

If your legs would feel better clear, the first step is a clinician mapping what is treatable. See how Pink treats leg spider veins.