VenousPublished: May 2026·Updated: May 2026·7 min read

Spider Veins vs Varicose Veins: What's the Difference?

Most people who notice fine red lines on their legs assume the worst. And most people with varicose veins assume it's just a cosmetic issue and not worth worrying about. Neither group is usually right. The short answer: spider veins are flat, tiny, and almost always harmless. Varicose veins are enlarged and bulging — caused by failing vein valves — and left alone, they tend to get worse. Here's everything you need to know to tell spider veins vs varicose veins apart, understand your risk, and know when to act.

Dr. Peter Chang

Triple Board-Certified Cardiologist & Vascular Specialist

What Are Spider Veins?

Spider veins — medically called telangiectasias — are dilated capillaries sitting at the very surface of the skin. They form flat, web-like or starburst patterns in shades of red, blue, or purple, typically under 1mm across. Run your finger over one and you'll barely feel it. They most commonly appear on the thighs, calves, and behind the knees — and occasionally on the face from sun exposure or rosacea. For most people, spider veins are a cosmetic concern only. They're rarely symptomatic, though some patients describe mild itching or a faint burning sensation. On their own, they carry no significant medical risk. But their presence can signal that venous pressure in your legs is creeping higher than it should — which is worth knowing if they're appearing in clusters or growing.

What Are Varicose Veins?

Varicose veins are a different problem entirely. These are enlarged, twisted veins — 3mm or wider — that visibly bulge above the skin surface, most commonly on the thighs and calves. The cause is mechanical failure: the one-way valves inside your veins stop closing properly, allowing blood to flow backwards and pool under pressure. The vein wall stretches and distends, producing the rope-like, dark-purple cords most people recognise. And unlike spider veins, they come with symptoms. Aching legs. A heavy, dragging feeling by mid-afternoon. Ankle swelling that's worst in the evening. Cramps at night. "Cosmetic" is the word patients often use to describe them. It is rarely the full story — and untreated varicose veins can eventually progress to skin damage and non-healing leg ulcers.

Spider Veins vs Varicose Veins: Side by Side

The confusion is understandable — both appear on the legs, both worsen with age and prolonged standing, and they frequently occur in the same patient at the same time. Here's what actually sets them apart:

Size — spider veins are under 1mm; varicose veins are 3mm or wider
Surface — spider veins are flat and flush with the skin; varicose veins bulge visibly above it
Colour — spider veins are red, blue, or purple; varicose veins are typically dark blue or purple
Symptoms — spider veins are usually silent; varicose veins cause aching, heaviness, swelling, and cramps
Medical risk — spider veins are almost always cosmetic; varicose veins can lead to skin ulceration, bleeding, and clotting
Treatment — microsclerotherapy or surface laser for spider veins; EVLT, foam sclerotherapy, or surgery for varicose veins

Causes and Risk Factors

Both conditions reflect one underlying problem: increased venous pressure in the legs. About one in three people will develop varicose veins at some point. The specific triggers overlap considerably:

Family history — the strongest single predictor; if both parents have varicose veins, your personal risk exceeds 90%
Prolonged standing or sitting — nurses, teachers, and desk workers accumulate venous pressure over years
Pregnancy — higher blood volume, hormonal changes, and uterine pressure on pelvic veins all contribute
Female sex — oestrogen and progesterone relax vein walls and increase susceptibility throughout life
Age — vein valves weaken naturally; both conditions become significantly more common after 40
Obesity — excess abdominal weight raises intra-abdominal pressure and impairs venous return from the legs
Previous DVT — deep vein thrombosis can permanently damage vein valves, leading to secondary venous insufficiency

Symptoms: When to Take It Seriously

Spider veins are almost always silent. Varicose veins are not. If you have any of the following, a specialist assessment is warranted — not because it's an emergency, but because venous insufficiency tends to progress quietly and steadily:

Leg aching or heaviness that builds through the day and eases when you put your feet up
Ankle or calf swelling present most evenings that clears overnight
Burning, throbbing, or itching over the affected veins
Restless legs at night or cramping in the calf
Skin discolouration or thickening above the ankle — a brownish stain or rough patch that won't resolve
A patch of eczema near the ankle that keeps recurring despite treatment

What Happens If Varicose Veins Go Untreated?

This is the part most people don't hear until the problem is already advanced. Varicose veins follow a predictable progression when ignored. First comes aching and swelling. Then the skin above the ankle starts to change — discolouring, thickening, becoming fragile. Then lipodermatosclerosis (hardening of the fatty tissue beneath the skin). And finally: venous leg ulcers.

Open wounds above the ankle that can take months — sometimes over a year — to heal, and carry a high recurrence rate. Superficial thrombophlebitis — a painful clot forming within the varicose vein itself — is also a real risk. Not every patient reaches the end of this progression. But there is no reliable way to predict who will, which is why early assessment matters. Learn more about our vein treatments or visit the Society for Vascular Surgery.

Treatment Options in Singapore

The right treatment depends on the size of the veins, whether there is underlying venous reflux, and your goals. A venous duplex ultrasound — which maps the venous system and identifies the source of any reflux — is always the first step before treatment is planned.

Microsclerotherapy — a fine needle injects sclerosant solution into spider veins; they fade over 4–8 weeks; multiple sessions are usually needed
Surface laser — targets spider veins on the face or very superficial leg vessels; no needles, minimal discomfort
Endovenous Laser Treatment (EVLT) — gold standard for large varicose veins; a laser fibre seals the vein from inside under ultrasound guidance; local anaesthesia, same-day discharge, rapid return to normal activities
Ultrasound-Guided Foam Sclerotherapy (UGFS) — foam sclerosant injected under ultrasound guidance treats varicose tributaries without incision
Mechanochemical Ablation (MOCA) — combines mechanical disruption with sclerosant injection; no heat required, so no tumescent anaesthesia
Surgical ligation and stripping — now rarely performed, but still appropriate in selected cases

Prevention: What Actually Works

You cannot stop a faulty valve from becoming faulty — genetics will do what genetics will do. But you can reduce the pressure that accelerates the problem, slow the progression of existing veins, and lower your overall risk. What the evidence consistently supports:

Compression stockings — graduated compression (20–30 mmHg) measurably reduces venous pressure; essential during long flights, long work shifts, and throughout pregnancy
Regular walking — calf muscle contraction is your legs' natural venous pump; 30 minutes daily makes a meaningful difference
Break up prolonged standing or sitting — get moving for a few minutes every 45–60 minutes
Leg elevation — raising your legs above hip height in the evening speeds venous return and reduces swelling
Weight management — reduced abdominal weight directly lowers pelvic venous pressure
Avoid high heels for extended periods — they reduce calf muscle pump efficiency

What About Reticular Veins?

There is a third type of vein that most articles skip entirely — and it explains why spider veins so often come back after treatment. Reticular veins sit between spider veins and varicose veins in size: typically 1–3mm, blue-green in colour, slightly raised but not bulging like a true varicose vein. They matter for two reasons. First, reticular veins frequently feed the spider vein clusters overlying them — treat the spider veins without addressing the reticular feeders and they will almost certainly recur within months. Second, they signal superficial venous hypertension that warrants a proper duplex assessment before cosmetic treatment is planned. If your spider veins keep coming back despite sclerotherapy, ask about reticular feeders.

Singapore: Medisave and Insurance Coverage

Purely cosmetic treatment — spider veins with no underlying venous insufficiency — is not Medisave-claimable and is typically excluded from integrated shield plans. Symptomatic varicose vein treatment is different. When there is documented clinical indication — confirmed symptoms, reflux on duplex ultrasound, and correct procedure coding under the Ministry of Health schedule — Medisave and many shield plans cover a meaningful portion of the cost. What your specialist needs to document: the duplex ultrasound report confirming venous reflux; a clinical record of your symptoms; and the appropriate procedure code. Some plans require pre-authorisation for EVLT specifically. Always confirm with your insurer before scheduling, and ensure your referral includes the clinical indication clearly stated.

Frequently Asked Questions

Common Questions About Spider Veins vs Varicose Veins

Can spider veins turn into varicose veins?

No — spider veins and varicose veins arise from different vessel layers and do not convert from one into the other. Spider veins develop in superficial capillaries; varicose veins develop in larger superficial veins with failing valves. However, if you have spider veins and underlying venous hypertension, varicose veins may also develop over time — not because the spider veins transformed, but because the same elevated pressure is driving both.

Are spider veins a sign of poor health?

Not necessarily. Many people with spider veins are healthy in every other respect. They're more common in women, in people who stand for long periods, and in those with a family predisposition — none of which reflects poor health. That said, extensive spider veins alongside leg symptoms (aching, heaviness, swelling) can indicate venous insufficiency, which is worth a proper assessment.

Should I be worried about varicose veins?

Worried? No. But you should take them seriously. Symptomatic varicose veins will usually worsen if left alone — that is the general pattern. The encouraging news is that treatment is straightforward, minimally invasive, and highly effective when done at the right stage. Early assessment is almost always better than waiting until complications develop.

Do varicose veins go away on their own?

No. Once a vein valve fails, it does not repair itself. Existing varicose veins do not resolve spontaneously. Compression stockings and leg elevation can reduce symptoms and slow progression but will not eliminate the veins or restore normal valve function. If resolution is the goal, treatment is required.

What happens if varicose veins are left untreated?

The typical progression runs from aching and swelling → skin discolouration and thickening above the ankle → lipodermatosclerosis (hardening of the fatty tissue under the skin) → venous leg ulceration. Superficial thrombophlebitis — a painful clot within the vein itself — is also a risk. Not everyone reaches the end of this progression, but there is no reliable way to predict who will.

Is it worth getting spider veins treated?

For purely cosmetic spider veins with no symptoms and no underlying reflux, treatment is a personal choice. Microsclerotherapy is safe, effective, and well-tolerated. The main caveat: if there are reticular feeder veins driving your spider veins, these need to be addressed first — otherwise the spider veins will recur. A duplex assessment before cosmetic treatment is worthwhile if your spider veins are extensive, are in both legs, or have recurred after previous treatment.