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Vein disease is graded on a seven-step scale, C0 to C6, called the CEAP classification. C1 is spider veins. C2 is varicose veins. C3 adds swelling. C4 is skin damage. C5 and C6 are a healed and an open ulcer. That scale, maintained by the American Venous Forum and updated in 202030063-9/fulltext), is what your doctor is using when they describe how far along your veins are.
Knowing your stage does two things. It tells you what is likely to happen next if nothing changes, and it tells you how much of the damage treatment can reverse.
The seven stages
The definitions below are the CEAP clinical classes, with what each one looks like in practice.
| Stage | Definition | What you notice |
|---|---|---|
| C0 | No visible or palpable signs of venous disease | Aching or heavy legs with nothing to see. Reflux may already be present on ultrasound |
| C1 | Telangiectasies or reticular veins | Spider veins, or flat blue reticular veins, usually painless |
| C2 | Varicose veins, 3 mm or more in diameter | Raised, twisting veins. Aching, itching, heaviness by evening |
| C3 | Edema | Ankles and lower legs swell during the day and settle overnight |
| C4a | Pigmentation or eczema | Brown staining or itchy, flaky skin around the ankle |
| C4b | Lipodermatosclerosis or atrophie blanche | Skin that has hardened and tightened, or white scarred patches |
| C5 | Healed venous ulcer | A sore near the ankle that has closed, leaving a scar |
| C6 | Active venous ulcer | An open sore that will not heal |
Each class also carries a letter: S for symptomatic, A for asymptomatic. C2S is a varicose vein that aches. C2A is one that does not.
Early stage varicose veins: what C0 to C2 feel like
The earliest stage often has no visible vein at all. Legs feel heavy or tired by the afternoon, ache after standing, and sometimes cramp at night. People put it down to age or being on their feet. What is happening is that a valve in the saphenous vein has started to leak, blood is pooling under pressure, and the surface veins have not yet stretched enough to show it. An ultrasound finds reflux at this stage even when the leg looks normal.
C1 is spider veins and reticular veins. They rarely cause symptoms and are treated for appearance, which is why they sit in their own class. Our guide to spider veins versus varicose veins covers the difference.
C2 is where most people are when they first come in. The vein is visible, it bulges, and it aches. This is also the stage where treatment does the most with the least, because there is nothing to reverse yet apart from the vein itself.
The middle: swelling and skin changes
C3 is swelling. It starts at the ankle, builds through the day, and is gone by morning. Sock lines that dent the skin are the classic sign. The swelling is fluid pushed out of the veins by pressure, and it is the first sign that pressure is affecting tissue beyond the vein.
C4 is when the skin starts to change. Iron from pooled blood stains it brown around the ankle. It gets itchy and flaky. Later it thickens and hardens into a tight, shiny band above the ankle. These changes are slow to reverse, and some of the staining is permanent, which is the strongest argument for treating a vein before it gets here.
The far end: ulcers
C5 and C6 are the same problem at two points in time: a sore near the ankle that is open, or one that has closed and left a scar. Venous ulcers form because the skin has been starved by pressure for years and a small knock breaks it. They heal slowly and come back easily. Treating the refluxing vein is what stops the cycle, which is why we see ulcers as a vein problem first and a wound problem second. Our page on venous leg ulcers goes into the details.
How fast do the stages progress?
Slowly, and not on a schedule. Many people sit at C2 or C3 for a decade. Some move from C3 to C4 in a few years. Nobody can tell you your rate in advance, because it depends on how much reflux there is, your weight, how much you stand, and factors nobody has measured yet. What is true is that the stages only go one way without treatment. Valves do not repair themselves.
The honest part: what treatment fixes at each stage
Closing the refluxing vein, with Varithena or laser ablation, removes the pressure at every stage. At C2 that usually means the aching goes and the veins shrink. At C3 the swelling improves. At C4 the itching and inflammation settle, but the brown staining mostly stays. At C6 the ulcer can finally heal, though it may take months.
The procedure is the same in-office treatment whichever stage you are at. What changes is how much damage is left behind. Earlier is not more urgent. It is just less to undo.
Where to start
If your legs ache and swell and you do not know your stage, an ultrasound in our office tells you in about half an hour. It also tells you whether treatment would be covered, because insurers use stage and symptoms to decide. You can request a consultation at either office.
