What are spider veins?

Spider veins, also known as thread veins or
telangiectasias, are small, visible blood vessels located close
to the surface of the skin.

They usually appear as thin red, blue or purple lines and may form branching patterns
that resemble a spider’s web or the branches of a tree.

Spider veins are commonly found on:

• the thighs;
• calves and ankles;
• behind the knees;
• the face, particularly around the nose and cheeks;
• other areas where small superficial blood vessels become visible.

Unlike typical varicose veins, spider veins are much smaller and generally do not form
the large, twisted, bulging veins that can be seen and felt beneath the skin.

You can learn more about their appearance and characteristics in our guide to

what spider veins are and how they can be treated
.

However, visible veins do not always tell the whole story.

A person can have spider veins without having significant underlying venous disease,
but spider veins may also coexist with varicose veins or other venous conditions.
This is one reason why the context in which they appear matters.

What actually causes spider veins?

There is no single universal cause of spider veins.

The small blood vessels become enlarged or dilated and therefore more visible through
the skin, but why this happens can vary from one person to another.

Several factors are associated with a greater likelihood of developing spider or thread veins.

1. Family history and genetics

Genetics and family history appear to play an important role in the development of spider veins.

If close family members have spider veins, varicose veins or other forms of venous disease,
you may have a greater predisposition to developing visible veins yourself.

However, genetic predisposition does not mean that spider veins are inevitable.

It is more accurate to think of family history as an important
risk factor rather than the sole cause.

2. Hormonal changes

Hormonal changes may influence the development of spider veins.

This is one reason visible veins may become more noticeable during pregnancy or other
periods of significant hormonal change.

Hormonal contraception and hormone therapy may also be relevant risk factors in some patients.

This does not mean that hormones alone cause spider veins in every case.
Their development is often influenced by several interacting factors.

3. Pregnancy

Pregnancy may increase the likelihood of developing visible veins.

Hormonal changes, changes in circulating blood volume and additional pressure on the venous
system can all influence the veins during pregnancy.

Some visible veins may improve after pregnancy, while others remain.

4. Prolonged standing or sitting

Spending long periods in the same position may contribute to increased venous pressure
and reduced effectiveness of the calf-muscle pump in the legs.

This can be particularly relevant for people whose occupations involve prolonged periods
of standing or sitting.

Teachers, healthcare professionals, retail workers, office workers and people who travel
frequently may spend many hours with limited movement.

This does not mean that sitting at a desk directly causes spider veins.
Prolonged inactivity is better understood as one possible risk factor, particularly in
someone who already has other predisposing factors.

5. Age

Spider veins can occur at many ages, but visible vascular changes may become more common
as people get older.

Ageing can affect blood vessels, connective tissues and the venous system.

However, spider veins are certainly not restricted to older adults.
Younger people can develop them too.

6. Excess body weight

Excess body weight may place additional pressure on the venous circulation of the legs
and is recognised as a risk factor associated with venous disease.

It should not, however, be presented as a simple cause-and-effect relationship.
People of all body types can develop spider veins.

7. Sun exposure and local skin factors

Spider veins on the face may have different contributing factors from those found on the legs.

Long-term sun exposure may contribute to visible superficial blood vessels,
particularly on exposed areas such as the cheeks and nose.

Local trauma and certain skin-related factors may also play a role in some cases.

Are spider veins caused by poor circulation?

Not necessarily.

You can have spider veins without having clinically significant chronic venous insufficiency.

However, some patients with spider veins, particularly on the legs, may also have
underlying venous reflux, varicose veins or another venous problem.

Venous reflux occurs when valves within parts of the venous system do not function effectively,
allowing blood to flow backwards and increasing venous pressure.

This mechanism is well established in varicose vein disease, but the relationship between
isolated spider veins and deeper venous problems is more complex.

For this reason, it is not appropriate to assume either that:

“Spider veins always mean poor circulation.”

or that:

“Spider veins are always purely cosmetic.”

A clinical assessment by a qualified vein specialist can help determine
whether further investigation is appropriate.

5 common myths about what causes spider veins

When people search for what causes spider veins, myths tend to appear
almost as often as facts.

Let us separate five common misconceptions from what is medically supported.

Myth 1: Wearing high heels causes spider veins

High heels are frequently blamed for spider veins, but wearing heels alone has not been
established as a direct cause of telangiectasias.

Footwear can influence how the foot and calf muscles function while walking, but that is
different from saying that a particular pair of shoes directly causes spider veins.

There is not sufficient evidence to make that simple cause-and-effect claim.

Myth 2: Crossing your legs causes spider veins

Crossing your legs occasionally does not, by itself, explain why spider veins develop.

Staying in one position for very long periods may not be ideal for venous circulation,
particularly if other risk factors are present.

However, crossing one leg over the other should not be confused with a proven direct
cause of spider veins.

Myth 3: Only women develop spider veins

False. Men develop spider veins too.

Women may have additional hormonal and pregnancy-related risk factors, and cosmetic concerns
about visible veins are often discussed more frequently among female patients.

However, both men and women can develop spider veins, varicose veins and other forms
of venous disease.

Myth 4: Spider veins only affect older people

Spider veins may become more common with age, but they are not restricted to older adults.

They can appear in younger people as well.

Family history, pregnancy, hormonal influences and other individual factors can all influence
when visible veins first become noticeable.

Myth 5: Creams can remove spider veins

A cream may moisturise the skin or temporarily alter its appearance, but topical cosmetic
creams do not physically close and remove established spider veins in the same way that
targeted medical treatments can.

Depending on the type, size and location of the veins, treatment may involve procedures
such as microsclerotherapy or selected laser and light-based treatments.

Be cautious with products promising to permanently “erase” or “dissolve” established
spider veins simply by applying a cream.

Spider veins vs varicose veins: what is the difference?

Spider veins and varicose veins are often discussed together, but they are not the same thing.

For a more detailed comparison, read

spider veins vs varicose veins: what’s the difference?

The important point is that appearance alone does not always reveal everything happening
within the venous system.

If visible veins occur together with leg heaviness, swelling, aching, skin changes or
prominent varicose veins, assessment by a vein specialist may be appropriate.

Are spider veins dangerous?

Spider veins on their own are usually harmless, and for many people the main concern
is their appearance.

However, saying that every visible spider vein is always purely cosmetic would be
an oversimplification.

In some patients, visible spider veins may coexist with varicose veins or other venous conditions.

When should visible veins be medically assessed?

Consider seeking medical advice if visible veins are accompanied by:

• persistent leg pain or aching;
• heaviness or tiredness in the legs;
• ankle or lower-leg swelling;
• itching or persistent skin irritation;
• skin pigmentation or other skin changes;
• larger bulging varicose veins;
• tenderness, redness or warmth around a vein;
• bleeding from a vein;
• ulceration or wounds that are slow to heal.

These symptoms do not automatically mean that you have a serious venous condition,
but they justify proper medical assessment rather than self-diagnosis.

Can you prevent spider veins?

There is no guaranteed way to prevent every spider vein.

You cannot change factors such as your genetics or age, and some people will develop
visible veins despite maintaining a healthy and active lifestyle.

However, supporting healthy movement and venous circulation may help address some
modifiable risk factors.

Useful measures may include:

• staying physically active;
• avoiding very long periods of complete inactivity;
• taking regular movement breaks if you work at a desk;
• moving your ankles and calf muscles during long journeys;
• maintaining a healthy weight where appropriate;
• discussing compression stockings with a healthcare professional when medically indicated;
• protecting facial skin from excessive sun exposure.

These measures should be viewed as ways of supporting general vascular and venous health,
rather than guaranteed methods of preventing spider veins.

Once established spider veins are visible, lifestyle changes alone will not usually
remove the existing vessels.

How are spider veins treated?

The appropriate spider vein treatment depends on several factors, including:

• where the spider veins are located;
• their size and depth;
• their colour and pattern;
• whether feeder veins are present;
• whether there are associated varicose veins;
• whether an underlying venous problem is suspected;
• your skin characteristics and medical history.

A proper assessment is therefore important before choosing treatment based only
on photographs or online advice.

Microsclerotherapy

Microsclerotherapy is an established treatment used for spider veins
and small superficial veins, particularly on the legs.

A very fine needle is used to inject a sclerosant into the targeted vessel.
This causes a controlled reaction within the vessel, leading it to close and gradually
become less visible as the body processes it over time.

More than one treatment session may be required depending on the number, size and
distribution of the veins.

Learn more about

sclerotherapy for spider veins and varicose veins
.

Laser treatment

Laser treatment uses controlled light energy to target selected visible blood vessels.

It may be useful for certain very small superficial vessels, including selected facial
spider veins, although suitability depends on the individual patient, vessel type
and skin characteristics.

Read our detailed guide to

laser treatment for spider veins
.

IPL – Intense Pulsed Light

Intense Pulsed Light uses broad-spectrum pulses of light and may be considered for
selected superficial vascular lesions and areas of redness.

IPL is not automatically the best treatment for every spider vein.
The type and location of the vessels should be assessed before deciding on treatment.

Laser or sclerotherapy: which is better?

There is no single treatment that is best for every visible vein.

The appropriate method depends on the vessel size, location, pattern and the presence
or absence of underlying venous disease.

For a direct comparison, read:

laser vs sclerotherapy for spider veins
.

You can also view examples in the

spider veins before and after gallery
.

Do you need an ultrasound scan for spider veins?

Not every person with a few isolated spider veins automatically requires an ultrasound scan.

The need for further investigation depends on your symptoms, clinical examination,
medical history and whether there are signs of associated venous disease.

If varicose veins or underlying venous reflux are suspected, a specialist may recommend
a duplex ultrasound scan to assess blood flow and the function of the veins.

The principle is important: when an underlying venous problem is suspected,
treatment should be based on a proper diagnosis rather than treating only what is visible
on the surface of the skin.

When should you see a vein specialist?

You may wish to consult a vein specialist if:

• you are unsure whether you have spider veins or varicose veins;
• your visible veins are becoming progressively more noticeable;
• you have pain, swelling, heaviness or itching;
• you have skin changes associated with visible veins;
• you have recurrent veins after previous treatment;
• you want to understand whether an underlying venous problem is present;
• the appearance of the veins affects your confidence and you want to discuss treatment.

A consultation does not automatically mean that you need a procedure.

Its purpose is to determine what type of veins you have, whether further investigation
is appropriate and which treatment, if any, is suitable for your individual situation.

Frequently asked questions about spider veins