Peripheral venous disease is a group of conditions in which the veins in your legs (and sometimes arms) can’t move blood back toward your heart efficiently. The most common form is chronic venous insufficiency, where damaged or weakened valves inside the veins allow blood to flow backward and pool in the lower legs. This pooling raises pressure inside the veins and, over time, causes symptoms ranging from mild swelling and visible veins to serious skin damage and open wounds that are slow to heal.
How Healthy Veins Work and What Goes Wrong
Your leg veins contain one-way valves that open to let blood flow upward toward the heart and snap shut to prevent it from sliding back down. When those valves weaken, stretch, or become scarred, blood reverses direction. This backward flow is called reflux. Some cases start in the superficial veins just beneath the skin, while others involve the deeper veins or the perforating veins that connect the two systems. When perforating vein valves fail, higher-pressure blood from the deep system pushes into the lower-pressure superficial veins, accelerating the damage.
The vein walls themselves can also widen over time, pulling the valve leaflets apart so they no longer seal properly. Regardless of the starting point, the end result is the same: sustained high pressure in the leg veins, a condition called venous hypertension. That pressure is what drives every symptom and complication of the disease.
Common Causes
The single biggest trigger is a prior blood clot in a deep leg vein, known as deep vein thrombosis (DVT). After the clot dissolves, scar tissue can damage the vein wall and its valves permanently. The resulting condition, called post-thrombotic syndrome, is one of the most common pathways to chronic venous insufficiency.
Other causes include prolonged standing or sitting (especially occupational), obesity, pregnancy, aging, and a family history of vein problems. Women are affected roughly twice as often as men. Varicose veins, which affect about one in three adults, are an early sign of venous pressure problems and can progress to full insufficiency over time.
Symptoms by Stage
Peripheral venous disease progresses through a recognized clinical staging system (called CEAP) that doctors use to grade severity from C0 through C6. Understanding where you fall on this scale helps clarify what’s happening in your legs and what to expect next.
- C0: No visible signs. You may have aching or heaviness, but nothing shows on the surface.
- C1: Small spider veins or reticular veins become visible, typically reddish or bluish threads under the skin.
- C2: Varicose veins appear, bulging 3 millimeters or wider, often dark purple or blue with a ropy, cord-like look.
- C3: Persistent swelling (edema) develops in the lower leg or ankle. This is the stage at which chronic venous insufficiency is formally diagnosed.
- C4: Skin changes set in. In earlier phases (C4a), the skin around the ankle darkens or develops eczema-like patches. In later phases (C4b), the skin and tissue beneath it thicken and harden, sometimes giving the lower leg a narrowed, “inverted champagne bottle” shape while the areas above and below remain swollen.
- C5: A venous ulcer has formed in the past but is currently healed.
- C6: An open, active venous ulcer is present.
The everyday experience of venous disease tends to center on heaviness, aching, and cramping in the legs that worsen through the day and improve when you elevate your feet. Itching and a sense of tightness around the ankles are common. These symptoms often feel worse in warm weather or after long periods of sitting or standing.
How It Differs From Peripheral Artery Disease
People sometimes confuse peripheral venous disease with peripheral artery disease (PAD) because both affect the legs. The distinction matters because the causes, symptoms, and treatments are quite different. PAD involves narrowed arteries that can’t deliver enough oxygen-rich blood to the legs. Its hallmark is leg pain while walking that eases with rest, along with coldness in the foot, weak pulses, and slow-healing sores on the toes or foot.
Venous disease, by contrast, is a drainage problem. The legs receive plenty of blood but can’t return it efficiently. Its hallmark symptoms are swelling, heaviness, skin discoloration around the ankles, and ulcers that typically form on the inner lower leg rather than the foot. Varicose veins are a signature feature of venous disease and are not associated with PAD. If your legs feel heavy and swollen at the end of the day and the discomfort improves when you put your feet up, the problem is more likely venous than arterial.
How It’s Diagnosed
Duplex ultrasound is the first-line test. It combines a real-time image of the vein’s structure with Doppler flow analysis that shows the speed and direction of blood movement. The technician will watch for reversed flow (reflux) by squeezing and releasing your calf or having you perform breathing maneuvers. Reflux duration is measured in seconds; longer backward flow confirms valve failure. The test is painless, uses no radiation, and can be performed at the bedside or in an outpatient vascular lab.
In most cases, duplex ultrasound provides all the information needed. It can identify blood clots, map which veins are affected, and measure how severe the reflux is, making it useful for both initial diagnosis and treatment planning.
Conservative Treatment
Compression stockings are the cornerstone of venous disease management. They work by applying graduated pressure, tightest at the ankle and decreasing up the calf, to help push blood upward and reduce pooling. For mild swelling and early-stage disease, stockings in the 15 to 20 mmHg range are often enough to control symptoms and prevent fluid buildup. For more advanced insufficiency, 20 to 30 mmHg stockings provide stronger support. Research shows that even light compression in the 10 to 15 mmHg range can effectively reduce swelling in people who stand or sit for long periods at work, while pressures below that threshold tend to be ineffective.
Elevation is equally important. Raising your legs above heart level for 15 to 30 minutes several times a day lowers venous pressure and helps drain accumulated fluid. Regular walking activates the calf muscle pump, which squeezes blood upward through the veins with each step. Weight management reduces the load on the venous system, and skin care (particularly keeping the lower legs moisturized) helps protect fragile skin from cracking and developing ulcers.
Procedures for More Advanced Disease
When conservative measures aren’t enough, several minimally invasive procedures can close off or remove damaged veins. Blood then reroutes through healthier veins nearby.
- Endovenous laser ablation (EVLA): A thin fiber is threaded into the damaged vein and delivers laser energy to seal it shut from the inside. It’s done under local anesthesia, typically as an outpatient visit.
- Radiofrequency ablation (RFA): Similar to laser ablation but uses radiofrequency heat instead. Both approaches avoid the need for surgical incisions and have largely replaced traditional vein stripping.
- Sclerotherapy: A solution is injected directly into the affected vein, causing it to scar closed. It’s commonly used for spider veins, smaller varicose veins, and as a complement to ablation procedures.
Recovery from these procedures is generally quick, with most people returning to normal activity within a few days. Compression stockings are typically worn for a period afterward to support healing.
What Happens if It’s Left Untreated
Peripheral venous disease is progressive. Without management, the sustained high pressure in the veins gradually damages the surrounding skin and tissue. One of the more serious complications is a condition where the skin and fat layer of the lower leg become chronically inflamed and then harden into thick, darkly pigmented, woody plaques. At this stage, even minor injuries like a scratch can break the skin and trigger an ulcer, because the fibrotic tissue underneath heals poorly.
Venous ulcers are the most significant complication. They tend to form near the inner ankle, can be painful, and are notoriously slow to close. Recurrence is common if the underlying vein problem isn’t addressed. People with advanced skin changes should inspect their lower legs regularly for cracks, signs of infection, or new wounds, and keep the skin well-moisturized to reduce the risk of breakdown. When ulcers do develop, specialized wound care is often needed to support healing and prevent permanent scarring.