Thread Veins of the Legs

What are thread veins?

Thread veins, sometimes called spider veins or telangiectasia, are very small widened blood vessels that can be seen through the surface of the skin.

They are usually less than 1 mm in diameter and may appear:

  • Red

  • Purple

  • Blue

  • Pink

They can form fine individual lines, small branching patterns or web-like clusters.

Thread veins are not the same as varicose veins. Varicose veins are larger, deeper veins which have become widened and may bulge beneath the skin.

Where do they occur?

Thread veins can occur almost anywhere on the body, but they are particularly common on the:

  • Ankles

  • Feet

  • Lower legs

  • Thighs

  • Face

They may occur as just a few tiny visible vessels or cover a much larger area.

Why do thread veins develop?

There is not always one obvious cause.

They tend to become more common with age and may be influenced by factors such as:

  • Family history and genetics

  • Pregnancy

  • Hormonal changes

  • Increasing age

  • Previous injury or surgery

  • Long periods spent standing

  • Underlying varicose veins or problems with venous circulation

For many people, however, thread veins simply appear without any significant underlying disease.

Are thread veins dangerous?

Usually, no.

Most thread veins are harmless and cause no physical symptoms. For many people their main concern is cosmetic.

Thread veins themselves do not normally interfere with circulation and do not automatically mean that you have poor circulation.

However, a large number of thread veins around the ankle or foot can occasionally occur alongside chronic venous insufficiency or varicose veins, particularly where there are other changes to the skin.

When should they be checked?

Visible thread veins alone usually do not require medical treatment.

However, further assessment is advisable if you also experience:

  • Aching, heaviness or persistent discomfort in the legs

  • Swelling around the feet or ankles

  • Itching or eczema-like skin changes

  • Brown or red pigmentation around the ankle

  • Hardened or thickened skin

  • Bulging varicose veins

  • Recurrent inflammation of veins

  • Wounds or ulcers that are slow to heal

These symptoms can be associated with underlying venous disease rather than simple thread veins. NICE recommends vascular assessment for symptomatic varicose veins and for certain associated skin changes, superficial thrombosis and venous ulceration.

What if a vein suddenly becomes painful?

A thread vein should not suddenly become hard, hot, swollen and painful.

If you develop a tender, hard or inflamed vein, particularly with swelling or pain in the leg, seek medical advice because this may represent superficial thrombophlebitis or another vascular problem rather than an ordinary thread vein.

Can thread veins be prevented?

There is no guaranteed way to prevent thread veins, particularly when genetics, age or hormonal factors are involved.

Looking after your general circulation is still worthwhile. This includes:

  • Remaining physically active

  • Avoiding prolonged periods of sitting or standing where possible

  • Moving the ankles and calves regularly

  • Maintaining a healthy weight

  • Elevating the legs when appropriate if you experience swelling

Compression hosiery may be useful for some people with underlying venous problems, but it is not routinely required simply because thread veins are visible.

Can thread veins be treated?

Yes. Where treatment is wanted for cosmetic reasons, options may include:

Microsclerotherapy – a small quantity of solution is injected into the affected vessels, causing them to close and gradually fade.

Laser or light-based treatment – energy is directed at the visible vessel, causing it to gradually collapse and become less noticeable.

Several treatment sessions may be required, and completely removing every visible vein cannot be guaranteed.

Importantly, treating the visible thread veins does not necessarily treat any underlying venous insufficiency. Where significant varicose veins or other symptoms are present, a vascular assessment may therefore be recommended first.

Will they come back?

Successfully treated vessels may disappear permanently, but new thread veins can develop elsewhere over time.

This is particularly likely where there is a genetic tendency towards thread or varicose veins or an underlying venous problem.

Thread veins and your podiatry assessment

During a foot and lower-limb assessment at Blackfords Footcare, we routinely observe the skin and circulation of the feet and lower legs.

A few harmless thread veins require no treatment. However, if their appearance is accompanied by swelling, skin changes, varicose veins, wounds or other signs suggesting an underlying vascular problem, we may recommend further assessment by your GP or an appropriate vascular service.

Sudden unexplained leg swelling, significant pain, heat or redness should be medically assessed promptly rather than waiting for a routine podiatry appointment.