Vein disease is a condition where the veins in your legs can’t efficiently return blood back to your heart. Normally, one-way valves inside your veins keep blood flowing upward against gravity. When those valves weaken or get damaged, blood flows backward and pools in the lower legs, creating sustained pressure that gradually damages the surrounding tissue. The umbrella term covers everything from spider veins and varicose veins to chronic venous insufficiency and blood clots.
How Healthy Veins Work and What Goes Wrong
Your leg veins rely on tiny flap-like valves spaced along their length. Each time your calf muscles contract (when you walk, for instance), they squeeze the veins and push blood upward. The valves snap shut behind it so blood can’t slide back down. This system is sometimes called the calf muscle pump, and it’s remarkably effective when everything works properly.
Vein disease starts when those valves stop closing completely. This can happen in three places: the superficial veins near the skin’s surface, the deep veins buried within the leg muscles, or the perforating veins that connect the two systems. In superficial veins, valves typically fail because they’ve weakened over time or the vein itself has widened enough that the valve flaps no longer meet in the middle. In the deep veins, prior blood clots are the usual culprit. A clot triggers inflammation that scars and stiffens the valve, leaving it permanently unable to close. When perforating vein valves fail, high-pressure blood from the deep system gets forced into the superficial veins, stretching them and causing their valves to fail too.
Regardless of where the breakdown occurs, the result is the same: venous hypertension, meaning chronically elevated blood pressure in the lower legs. That sustained pressure drives every symptom and complication of vein disease.
Types of Vein Disease
Vein disease exists on a spectrum. Doctors classify its severity using a system called the CEAP scale, which has seven clinical stages:
- C0: No visible signs. You may have symptoms like heaviness or aching, but nothing can be seen or felt on the surface.
- C1: Spider veins or small reticular veins appear, typically under 3mm in diameter.
- C2: Varicose veins, defined as bulging veins 3mm or larger. These are the ropy, twisted veins most people picture when they think of vein disease.
- C3: Swelling (edema) in the leg, often worse at the end of the day.
- C4: Skin changes develop. Early on, this looks like brownish discoloration or eczema around the ankles. Later, the skin and tissue underneath can harden and thicken, a condition called lipodermatosclerosis.
- C5: A venous ulcer that has healed but left a scar.
- C6: An active, open venous ulcer. This is the most advanced stage.
Deep vein thrombosis (DVT), a blood clot in one of the deep leg veins, is both a type of vein disease and a major driver of it. A DVT can cause permanent valve damage that leads to chronic venous insufficiency years later.
Who Is Most at Risk
A history of deep vein thrombosis is the single most important risk factor for developing chronic vein disease. Beyond that, several factors raise your likelihood: a family history of varicose veins, obesity, pregnancy, smoking, being over 50, and being female. Occupational habits matter too. Jobs that require prolonged standing or sitting, without much walking in between, reduce the calf muscle pump’s activity and let blood pool in the legs for hours at a time. Even habitually sleeping in a chair or recliner, where your legs hang partially down, can contribute.
Symptoms to Recognize
Early vein disease often feels worse than it looks. You might notice a heavy, tired sensation in your legs by late afternoon, or an aching that improves when you elevate your feet. Itching, burning, or a restless feeling in the legs at night are common. Swelling around the ankles that leaves a dent when you press on it is another early sign.
As the disease progresses, visible changes appear. Varicose veins bulge along the calf or thigh. The skin around the ankles may darken to a brownish color due to iron deposits from leaking red blood cells. In advanced stages, the skin becomes fragile, dry, and prone to breaking down. Even minor injuries can turn into slow-healing wounds. Ulcers that don’t shrink by at least 25% within four weeks, or that haven’t healed within 12 weeks, generally need specialist evaluation.
How Vein Disease Is Diagnosed
The primary diagnostic tool is a duplex ultrasound, a painless, noninvasive scan that combines a standard ultrasound image with Doppler technology to visualize blood flow in real time. During the exam, a technician will squeeze your calf or have you perform specific maneuvers while watching which direction blood moves on the screen. If blood flows backward (reflux), the ultrasound picks it up on both the color display and a waveform tracing. The duration of that backward flow, measured in seconds, helps determine how severe the valve failure is. This test can evaluate superficial veins, deep veins, and perforating veins in a single session.
Conservative Treatment: Compression and Exercise
Compression stockings are the foundation of vein disease management. They work by applying graduated external pressure to the leg, which narrows the veins, speeds up blood flow, and helps the damaged valves close more effectively. Different pressure levels achieve different effects. Stockings in the 20 to 30 mmHg range can improve microcirculation, boost the calf muscle pump’s efficiency, and help the veins empty more completely. Pressures above 30 mmHg provide additional benefit for reducing vein diameter even while standing, which is when symptoms are typically worst. Your provider will recommend a specific pressure based on your disease stage.
Exercise is equally important. Strengthening your calf muscles directly improves the pump mechanism that pushes blood out of your legs. Effective exercises include rising onto your toes (calf raises) in sets of 10 to 15 repetitions, ankle circles, alternating between flexing your foot up and pointing it down, and walking on a treadmill or outdoors. Research on patients with chronic venous insufficiency has tested programs ranging from six to nine weeks, typically involving calf raises, walking, and calf stretches performed daily or three times a day. The key is consistency: even a simple routine of toe raises and a daily walk can meaningfully improve how well your veins function.
Procedures for More Advanced Disease
When compression and lifestyle changes aren’t enough, minimally invasive procedures can close off or remove malfunctioning veins. The two most common options are endovenous laser ablation (EVLA) and ultrasound-guided foam sclerotherapy (UGFS). In laser ablation, a thin fiber is inserted into the vein and delivers heat energy that seals it shut. In foam sclerotherapy, a chemical foam is injected that irritates the vein lining, causing it to collapse and close.
Both procedures are effective. In studies of patients with venous ulcers, laser ablation healed 97% of ulcers and foam sclerotherapy healed about 86%, with both achieving complete healing in roughly 60 days on average. The critical difference is in recurrence: ulcers came back in only 3% of laser-treated patients compared to 31% of those treated with foam sclerotherapy. This makes laser ablation the stronger long-term option for patients with advanced disease. Both procedures are done in an outpatient setting, typically under local anesthesia, and most people return to normal activities within days.
What Happens Without Treatment
Vein disease is progressive. Without intervention, mild symptoms like heaviness and visible varicose veins can advance to skin damage, chronic swelling, and eventually open ulcers. Venous leg ulcers are notoriously difficult to heal and highly prone to coming back. Recurrence rates in patients managed with compression alone can reach 38% within three years and as high as 56% at four years. Adding a corrective procedure to compression therapy cuts that recurrence roughly in half, to around 31% at four years, and in some studies as low as 9%.
The progression isn’t inevitable, though. Consistent use of compression stockings, regular calf-strengthening exercise, maintaining a healthy weight, avoiding prolonged standing or sitting, and elevating your legs when possible can slow or stall the disease at any stage. The earlier you address it, the simpler the management tends to be.