Untreated varicose veins tend to get worse over time, not better. While many people live with them for years as a cosmetic nuisance, the underlying valve damage is progressive. About one in three people with varicose veins will eventually develop skin changes and chronic venous insufficiency, raising their risk of complications like ulcers, blood clots, and even spontaneous bleeding.
How quickly things progress varies widely from person to person. But the direction is almost always the same: once the valves in your leg veins stop working properly, a self-reinforcing cycle of damage begins that conservative measures can slow but rarely reverse.
Why Varicose Veins Get Worse on Their Own
Healthy veins in your legs contain one-way valves that push blood upward toward your heart. These valves also break the tall column of blood in your leg into smaller segments, so the full weight of that column doesn’t press down on the veins near your ankles. When valves fail, blood flows backward and pools in the lower leg. This is called venous reflux.
The problem is self-reinforcing. As blood pools, it stretches the vein wall. A stretched vein means the valve leaflets can no longer close completely, which allows more blood to pool, which stretches the vein further. The veins lack the muscular support that arteries have, so once this cycle starts, there’s no built-in mechanism to stop it. Over time, the increased pressure pushes fluid, proteins, and even red blood cells out of the capillaries and into surrounding tissue, setting off a chain of inflammatory damage in the skin and fat of the lower leg.
The Stages of Progression
Doctors classify venous disease on a scale from C0 (no visible signs) to C6 (an open, active ulcer). Varicose veins themselves are classified as C2, veins 3 millimeters or wider that bulge visibly. Here’s what the later stages look like in practice:
- Swelling (C3): Persistent edema in the lower leg, especially by the end of the day or after standing for long periods. This isn’t just water retention; it reflects sustained high pressure in the venous system.
- Skin changes (C4): The skin around the ankle begins to darken, turning brown or reddish-brown from iron deposits left by leaking red blood cells. Eczema-like patches may appear. In more advanced cases, the skin and underlying fat become thick, hard, and inflamed, a condition called lipodermatosclerosis.
- Healed ulcer (C5): Evidence of a previously open wound that has closed but left scarring.
- Active ulcer (C6): An open, slow-healing wound, typically near the inner ankle, caused by tissue that has been starved of adequate oxygen and nutrition for too long.
A 13-year study tracking the general population in Edinburgh found that 31.9% of people who started with only varicose veins progressed to skin changes consistent with chronic venous insufficiency. The rate increased with age. This means roughly one in three people with untreated varicose veins will move into a stage where ulceration becomes a real possibility.
Skin Damage and Ulcers
The skin changes caused by chronic venous pressure are more than cosmetic. In lipodermatosclerosis, the lower leg develops firm, “woody” plaques of thickened, darkly pigmented tissue. In advanced cases, the scarring narrows the lower leg while the calf and ankle remain swollen, creating what’s sometimes described as an “inverted champagne bottle” shape. This tissue is fragile, poorly nourished, and slow to heal from even minor injuries.
All of these skin changes are considered pre-ulcer conditions. As tissue nutrition and oxygen delivery continue to decline, cells begin to die. A small scrape or bump that would heal normally on healthy skin can trigger an ulcer that takes weeks or months to close. Venous ulcers are painful, prone to infection, and have a frustrating tendency to recur even after healing.
Blood Clot Risk
Varicose veins increase the risk of blood clots, both in the superficial veins (superficial thrombophlebitis) and in the deeper veins of the leg (deep vein thrombosis, or DVT). A large population-based study following patients for a median of 7.5 years found that people with varicose veins had roughly five times the risk of developing DVT compared to those without. The risk was highest in younger adults, with people around age 45 facing about four times the odds.
Superficial thrombophlebitis, a clot in a varicose vein near the skin surface, causes a painful, hard, red lump along the vein. It’s usually not dangerous on its own, but it can sometimes extend into the deep venous system. DVT is more serious because clots in the deep veins can break loose and travel to the lungs, causing a pulmonary embolism. The same study found the risk of pulmonary embolism was about 1.7 times higher in people with varicose veins, though genetic analysis suggests the causal link is stronger for DVT than for pulmonary embolism specifically.
Spontaneous Bleeding
Varicose veins sit close to the skin surface, and over time the skin covering them thins. A minor bump, a scratch, or sometimes nothing at all can rupture a varicose vein and cause significant bleeding. In a study of over 1,000 patients with chronic venous disease followed for four years, about 3% experienced bleeding from their varicose veins. That number sounds small, but the bleeding can be dramatic and, in rare cases, fatal. Roughly 1 in 1,000 autopsies for sudden death are attributed to hemorrhage from ruptured varicose veins.
Most bleeding episodes can be controlled by lying down, elevating the leg, and applying firm pressure. But the fact that it can happen without warning, sometimes during sleep when the person doesn’t notice right away, makes it one of the more alarming complications of leaving varicose veins untreated long-term.
Daily Symptoms That Worsen Over Time
Even before the dramatic complications, untreated varicose veins take a toll on quality of life. Heavy, aching legs are the hallmark symptom, often worst at the end of the day. Swelling, throbbing, itching around the veins, and nighttime leg cramps are common. International survey data shows that over 76% of patients being treated for venous disorders reported heaviness, aching, or swelling, even those in the earliest clinical stages. These symptoms tend to intensify gradually, limiting how long you can stand, walk, exercise, or stay comfortable at work.
When Treatment Is Recommended Over Waiting
Current clinical guidelines from the Society for Vascular Surgery strongly recommend treatment over long-term compression stockings for patients who have symptomatic varicose veins with confirmed backward blood flow in the main superficial veins. Compression stockings can relieve symptoms and slow progression, but they don’t fix the underlying valve failure. They’re considered a reasonable option for people who can’t undergo a procedure or prefer to try conservative management first, but the evidence favors intervention for most candidates.
Modern treatments are minimally invasive, typically performed in an office setting, and involve closing or removing the damaged vein so blood reroutes through healthier vessels. Recovery is measured in days, not weeks. The earlier treatment happens in the progression from C2 toward C4 and beyond, the less tissue damage accumulates and the better the long-term outcome. Waiting doesn’t make the problem easier to treat; it makes the consequences harder to reverse.