Your legs feel heavy by 4 p.m. Your ankles leave a sock line. A vein on your calf looks a little more raised than it did last year. Most people wait years before asking a doctor about any of this, because none of it feels urgent.
What are varicose veins? Varicose veins are enlarged, twisted superficial veins, usually in the legs, that develop when the one way valves inside those veins stop closing properly and blood flows backward and pools instead of returning to the heart. That backward flow is called venous reflux. Varicose veins are typically 3 mm or more in diameter, appear blue or purple under the skin, and often cause aching, heaviness, itching, or ankle swelling long before they look dramatic.
At Vein and Knee Pain Vascular Group, the patients who do best are the ones who came in during the aching stage rather than the ulcer stage. This guide explains what varicose veins are, the full symptom picture, the early warning signs that get dismissed as normal tiredness, and how vascular specialists stage the condition from C0 to C6.
What Are Varicose Veins? A Clear Definition
Varicose veins are superficial leg veins that have become permanently stretched and tortuous because the valves inside them have failed, allowing blood to pool under gravity. The Society for Vascular Surgery estimates that as many as 40 million Americans have varicose veins, which makes this one of the most common vascular conditions in the country.
The key word is superficial. Your legs have two venous systems. Deep veins sit inside the muscle and carry the large majority of blood back toward the heart. Superficial veins sit just under the skin and feed into the deep system through connecting perforator veins. Varicose veins form in the superficial system, which is exactly why you can see and feel them.
How Healthy Leg Veins Are Supposed to Work
Leg veins move blood upward against gravity because of two things working together: the calf muscle pump and a series of one way valves. Every step you take squeezes the calf muscle, which pushes blood upward, and the valves snap shut behind that blood so it cannot fall back down.
When a valve leaflet weakens, stretches, or gets damaged, it no longer seals. Blood falls backward through the open valve, which is venous reflux. That refluxed blood raises pressure inside the vein below, the vein wall stretches under the extra load, and the stretching pulls the next valve down apart so it also fails. Varicose veins are therefore progressive because valve failure cascades downward, which means the condition rarely stays exactly where it started.
This cascade is also why varicose veins do not reverse on their own. The valve is a mechanical structure. Once it has stretched past the point of sealing, rest, exercise, and creams do not rebuild it.
Varicose Veins vs Spider Veins
Varicose veins and spider veins share a cause but sit at different points on the same disease spectrum. Spider veins, medically called telangiectasias, are tiny red, blue, or purple lines in the skin surface, usually under 1 mm, that form web like or sunburst patterns. Varicose veins are the large, raised, rope like cords you can push on and feel.
The revised CEAP consensus published in the Journal of Vascular Surgery draws the line at diameter: a vein is classed as varicose when it measures 3 mm or more. That threshold matters because spider veins are frequently a surface signal of reflux happening in a larger vein underneath. Our full breakdown of varicose veins vs spider veins covers how each one is treated.
Not every raised vein is varicose either. Athletes, very lean people, and people who spend long hours on their feet often have prominent but perfectly healthy veins. If you are unsure which category you fall into, bulging veins in legs that are not varicose explains the difference, and why your veins are so visible covers the harmless causes.
What Causes Varicose Veins to Develop
Varicose veins develop when venous pressure in the superficial leg veins stays chronically elevated, because sustained pressure stretches vein walls until the valves inside can no longer close. Anything that raises that pressure or weakens the vein wall increases your risk.
The most established contributing factors are:
- Family history: Inherited vein wall and valve weakness is the single strongest predictor, which is why varicose veins run in families so consistently.
- Prolonged standing or sitting: Nurses, teachers, hairstylists, retail staff, surgeons, and long haul drivers all sit at elevated risk because the calf pump goes idle.
- Pregnancy: Blood volume rises sharply, progesterone relaxes vein walls, and the growing uterus compresses pelvic veins.
- Age: Vein walls and valve leaflets lose elasticity over decades.
- Sex: Women are affected more often than men, largely because of hormonal influence on vein wall tone.
- Excess body weight: Higher abdominal pressure translates directly into higher leg vein pressure.
- Previous DVT or leg trauma: Damage to the deep system pushes overflow into superficial veins.
One clinical detail worth knowing: because reflux often begins at a single junction, such as the saphenofemoral junction in the groin, varicose veins commonly show up on one side only. That is normal disease behavior, not a sign of something unusual, and we explain it in varicose veins in one leg only.
Symptoms of Varicose Veins
The symptoms of varicose veins split into two groups: what you can see, and what you can feel. The second group is the one that actually drives people to treatment, because visible veins are often painless while the sensations are not.
Visible signs
- Large, twisted, bulging veins that stand up above the skin surface
- Blue, purple, or dark rope like cords, most often on the calf, inner thigh, or behind the knee
- Spider veins clustered in the same region as the larger varicose veins
- Blue or brown skin discoloration near the shins, calves, or ankles
- Dry, red, itchy patches over the vein, known as venous eczema or stasis dermatitis
- Hard, thickened, tight feeling skin above the ankle, called lipodermatosclerosis
Symptoms you feel
- Leg heaviness, especially in the evening or after a long shift
- Aching legs and throbbing along the course of the vein
- Ankle swelling that is worse at night and gone by morning
- Itching or burning directly over the vein
- Night cramps and restless legs
- Legs that feel noticeably better when you elevate them
There is a signature pattern here that helps distinguish venous symptoms from other causes. Venous symptoms get worse with standing and better with elevation, and they build through the day rather than being present at first waking. Arterial pain does the opposite. If your discomfort peaks in bed, why your legs hurt at night is worth reading, and if the sensation is specifically burning, burning sensation in the leg below the knee covers the differential.
Venous pressure can also refer discomfort into the joint, which surprises many patients. That connection is covered in can varicose veins cause knee pain.
Early Stage Varicose Veins Symptoms Most People Ignore
Early stage varicose veins symptoms usually appear before any vein looks abnormal, because reflux raises venous pressure long before the vein wall visibly stretches. In practice, this is the most commonly missed window in vein care.
A typical first presentation in our New York office looks like this: a patient in their thirties or forties, on their feet most of the day, describing legs that feel tired and full by evening. No bulging veins. Maybe some faint bluish lines. They assumed it was normal fatigue for someone who stands all day.
Watch for these early warning signs:
- Evening heaviness that resolves overnight and returns the next afternoon
- Sock indentation at the ankle at the end of the day, which is mild edema
- A shiny or tight look to the skin over the lower leg from fluid accumulation
- Faint bluish or raised lines that were not there a year ago
- Itching over one specific area of the calf with no rash and no dry skin elsewhere
- Restless legs or cramping at night, particularly in one leg more than the other
- Small red spots or fine spider veins clustering around the ankle
Why the early window matters: at this point, the disease is a valve problem in one or two vein segments. Treated then, the procedure is straightforward and the skin is undamaged. Once venous stasis has produced pigmentation, the discoloration is often permanent even after the underlying vein is successfully closed.
The Stages of Varicose Veins: CEAP Classification C0 to C6
Vascular specialists stage venous disease using the CEAP classification, developed by the American Venous Forum in 1994 and revised in 2004. CEAP stands for Clinical, Etiologic, Anatomic, and Pathophysiologic. In daily practice the clinical score, C0 through C6, is what determines urgency and treatment, and it is also what most insurers use when reviewing coverage.
| Stage | Clinical Finding | What You Notice | Priority |
|---|---|---|---|
| C0 | No visible or palpable signs of venous disease | Legs may still ache or feel heavy, with nothing visible | Evaluate if symptoms persist |
| C1 | Telangiectasias (spider veins) or reticular veins | Fine red, blue, or purple web like lines | Often cosmetic, but can signal reflux underneath |
| C2 | Varicose veins, 3 mm or more in diameter | Raised, twisted, rope like veins you can feel | Ultrasound assessment recommended |
| C3 | Edema attributable to venous disease | Ankle and foot swelling, worse by evening | Treat to prevent skin change |
| C4a | Pigmentation or venous eczema | Brown staining, itchy red scaly skin near the ankle | Treat promptly, discoloration can be permanent |
| C4b | Lipodermatosclerosis or atrophie blanche | Hard, tight, thickened skin, or white scar like patches | Urgent specialist care |
| C5 | Healed venous ulcer | A past open sore that has closed | High recurrence risk without vein treatment |
| C6 | Active venous ulcer | An open, slow healing wound, usually above the ankle | Immediate vascular care |
Two things about this table matter more than the labels themselves.
First, CEAP adds an S or A to indicate symptomatic or asymptomatic. A C2S patient with visible veins and daily aching has a genuine medical problem. A C2A patient with the same veins and no symptoms may reasonably choose monitoring. This is why two people with identical looking legs get different recommendations.
Second, the stages are not a fixed track. Treating the refluxing vein can move a patient back down the scale, and successfully closing the source vein is what prevents C5 patients from returning to C6. You can see stage change in practice in our varicose veins before and after gallery.
When Varicose Veins Become a Medical Problem
Varicose veins become a medical rather than cosmetic concern once symptoms interfere with daily life or once the skin begins to change, because both indicate that venous hypertension is damaging tissue and not just stretching a vein.
Seek evaluation promptly if you notice skin discoloration around the ankle, an open or slow healing sore, a vein that becomes hard, hot, red, and tender, which suggests superficial thrombophlebitis, or sudden calf swelling with pain, which needs same day assessment to rule out deep vein thrombosis. The distinction between the two conditions is covered in DVT vs varicose veins, and the clot question specifically in can varicose veins cause blood clots.
Bleeding from a varicose vein is a true emergency. A thin walled vein under high pressure sitting close to the skin surface can rupture from a minor knock and bleed significantly. Elevate the leg above heart level, apply firm direct pressure, and seek immediate care. See can varicose veins burst for what to do in the moment, and when to worry about varicose veins for the wider warning list.
How Varicose Veins Are Diagnosed
Diagnosis of varicose veins is confirmed by duplex ultrasound, because visible veins reveal where blood is pooling but not where the reflux is originating. Treating the bulge without finding the source is the most common reason varicose veins recur.
At Vein and Knee Pain Vascular Group, Dr. Amir Salem, MD begins with a standing physical examination, since leg veins fill under gravity and can look almost normal lying down. A duplex ultrasound then maps your venous anatomy, measures how long blood flows backward through each valve, confirms which segments are incompetent, and rules out clot in the deep system. That map is what determines whether the right treatment targets the great saphenous vein, a perforator, or a surface tributary.
If you are unsure who performs this work, what a vein specialist is called explains the credentials to look for.
What You Can Do Right Now
These measures reduce symptoms and slow progression. They do not repair a failed valve, so treat them as management rather than cure.
- Move your calves hourly: Twenty heel raises reactivate the calf pump. This is the single most useful habit for anyone who stands or sits all day.
- Elevate above heart level for 15 minutes, twice daily: Legs on the sofa arm is enough. Gravity does the work.
- Wear graduated compression stockings: Put them on before you get out of bed, while the legs are least swollen.
- Walk daily: Walking, swimming, and cycling all drive venous return without loading the veins the way heavy squatting does.
- Manage weight and avoid prolonged static standing: Shift your stance, and use a footrest if you stand at a fixed station.
- Get an ultrasound if symptoms persist past a few weeks: Reflux is invisible from the outside, so a clinical guess is not a substitute for imaging.
Treatment Options for Varicose Veins
Modern varicose vein treatment closes the failed vein so blood reroutes through healthy veins, which is why removal surgery is now rarely necessary. All of the options below are performed in office with local anesthetic.
| Treatment | How It Works | Best Suited For | Downtime |
|---|---|---|---|
| Radiofrequency ablation | Heat energy seals the diseased vein from the inside | Refluxing saphenous trunk veins | Walk out same day |
| Endovenous laser ablation | Laser energy closes the vein wall | Straight, larger truncal veins | Walk out same day |
| Sclerotherapy | Injected solution scars and closes the vein lining | Spider veins and smaller varicosities | Minimal |
| Varithena foam | Microfoam fills and collapses the vein | Tortuous veins hard to reach with a catheter | Minimal |
| VenaSeal closure | Medical adhesive seals the vein, no heat used | Patients who prefer no compression stockings after | Minimal |
| Ambulatory phlebectomy | Bulging surface veins removed through tiny punctures | Large visible cords after the source is closed | A few days of bruising |
Which one is right depends entirely on your ultrasound map, vein diameter, and symptoms. Our overview of the best treatment for varicose veins compares outcomes, and vein ablation recovery week by week sets expectations for afterward. Full procedure details are on our varicose vein treatment page.
Frequently Asked Questions
Do varicose veins go away on their own?
No. Varicose veins do not resolve without treatment, because the damaged one way valve inside the vein is a mechanical structure that cannot repair itself. Symptoms may fluctuate, and pregnancy related veins sometimes improve after delivery, but an established varicose vein persists and tends to worsen slowly over years.
What does early stage varicose veins feel like?
Early stage varicose veins usually feel like leg heaviness, aching, or fullness that builds through the day and eases with elevation. Many people also notice mild ankle swelling, night cramps, or itching over one area of the calf. These sensations often appear before any vein becomes visibly bulging or twisted.
Are varicose veins dangerous?
Most varicose veins are not dangerous, but untreated venous reflux can progress to complications. The recognized risks are venous ulcers, superficial thrombophlebitis, bleeding from a ruptured vein, and permanent skin discoloration. Skin changes around the ankle or an open sore should be assessed by a vein specialist promptly.
What stage of varicose veins do I have?
Only a duplex ultrasound and clinical exam can confirm your CEAP stage. As a general guide, spider veins alone suggest C1, raised twisted veins suggest C2, added ankle swelling suggests C3, and brown or itchy skin near the ankle suggests C4. Staging determines both urgency and insurance eligibility.
Is treatment for varicose veins covered by insurance?
Coverage commonly applies when varicose veins are symptomatic rather than purely cosmetic, which is one reason CEAP staging matters. Most carriers require documented symptoms, an ultrasound confirming reflux, and often a trial of conservative measures first. Our team verifies benefits with your insurer before any treatment is scheduled.
The Bottom Line
So, what are varicose veins? They are enlarged, twisted superficial veins caused by failed valves and venous reflux, and they sit on a progressive scale that runs from invisible symptoms at C0 all the way to open ulceration at C6. The visible vein is the last thing to appear and the least important thing to measure. Heaviness, aching, evening ankle swelling, and itching are the signals that actually matter, and they show up years earlier.
Progression is slow, which is exactly what makes it easy to ignore. It is also what makes early evaluation so effective, because a valve problem caught at C2 is a straightforward in office procedure, while skin damage at C4 can leave permanent marks even after successful treatment.
If your legs feel heavy at the end of the day, schedule a consultation with Vein and Knee Pain Vascular Group. A duplex ultrasound takes under an hour and tells you exactly which stage you are at and whether treatment is warranted.
