Spider Veins: what it usually means
Also searched as: telangiectasia, thread veins, broken capillaries · Updated 19 Aug 2026 · Educational — not medical advice
The short answer: Spider veins are small, visible clusters of dilated blood vessels near the skin's surface, appearing as thin red, blue, or purple web-like lines, most often on the legs and face. They're caused by weakened vessel walls and increased pressure in small veins, and while usually a cosmetic concern, they can occasionally signal broader vein problems. Spider veins with leg swelling, aching, or skin changes deserve evaluation rather than only cosmetic treatment.
See a doctor promptly if…
Spider veins alongside leg swelling, aching, heaviness, or throbbing, which can point to a larger underlying vein problem.
Skin discoloration, hardening, or an open sore near the veins.
Rapidly increasing number or size of spider veins over a short period.
Visible bulging (varicose) veins alongside the spider veins.
Common causes
- Genetics — A family history of spider or varicose veins strongly increases the likelihood of developing them.
- Prolonged standing or sitting — Extended time on your feet or seated increases pressure in leg veins over the day, weakening vessel walls over time.
- Pregnancy — Increased blood volume and hormonal changes during pregnancy commonly bring on new spider veins, especially in the legs.
- Aging — Vein walls and valves naturally weaken with age, making spider veins more common over time.
- Sun exposure — UV exposure damages small blood vessels near the skin's surface, contributing to facial spider veins.
- Hormonal changes or birth control — Estrogen-related changes, including hormonal birth control, can affect vein wall tone and increase spider vein formation.
What helps
- Elevate the legs periodically and avoid prolonged standing or sitting without moving.
- Wear compression stockings if legs feel heavy or achy by the end of the day.
- Stay active with regular walking, which supports healthy blood flow in the legs.
- Use sunscreen on the face to help prevent new facial spider veins from sun exposure.
Which doctor to consult
A dermatologist or vascular specialist can evaluate whether spider veins are purely cosmetic or linked to broader vein insufficiency, and offer treatments like sclerotherapy or laser if desired.
Questions people ask
Are spider veins the same as varicose veins?
No — spider veins are small, flat, thread-like vessels close to the skin's surface, while varicose veins are larger, raised, and often bulge visibly under the skin. They share some of the same causes, and having spider veins doesn't mean varicose veins will follow, though both can occur together.
Do spider veins mean something is wrong with my circulation?
For most people, spider veins are a cosmetic issue from weakened surface vessels rather than a sign of a circulation problem. They're worth evaluating further if accompanied by leg swelling, aching, or heaviness, which can indicate that deeper veins aren't draining blood as efficiently as they should.
Related symptoms
This guide is educational and doesn't replace a clinical assessment. If a symptom is severe, rapidly worsening, or worrying you, see a doctor — being checked and reassured is never a wasted visit.