Know the Basics of Chronic Venous Insufficiency

Venous insufficiency is a condition commonly associated with varicose veins. If you’ve recently sought varicose vein treatment near Houston, then your vein specialist may have diagnosed you with this condition. Watch this video to gain a better understanding of chronic venous insufficiency.

Inside of your veins are valves that help the blood in areas like your legs and ankles move back up to the heart. The valves work by opening with each pump from your heart, and closing in-between beats. This prevents blood from falling backward.

However, when these valves fail to shut properly, this can allow blood to fall downward and accumulate in the veins in your legs. Over time, this accumulation can cause your veins to stretch and elongate, resulting in varicose veins, leg swelling and pain, and skin discoloration.

What Is Chronic Venous Insufficiency?

Chronic venous insufficiency describes a vein system that can no longer move blood out of the legs efficiently. The word chronic matters here. This is not a sudden event like a blood clot. It develops gradually, often over years, and tends to get slowly worse when the underlying cause is left alone.

The legs have two main sets of veins. The deep veins run inside the muscles and carry most of the blood back to the heart. The superficial veins, including the great and small saphenous veins, run just under the skin and drain into the deep system. Small perforator veins connect the two. CVI can involve any of these, but in most of the patients we see, the problem starts in the superficial veins, which is good news because those are the easiest to treat.

Why pressure is the real problem

When the valves leak, blood that should be heading upward falls back toward the ankle every time you stand or sit with your feet down. Doctors call this venous reflux. The result is a constant column of high pressure in the lower leg, called venous hypertension. That pressure stretches vein walls, pushes fluid into the tissues and slowly damages the skin. Almost every symptom of CVI, from tired legs to ulcers, traces back to it.

Common Symptoms of Chronic Venous Insufficiency

CVI symptoms usually follow a pattern: they are mild in the morning, build through the day, and ease when you lie down or put your feet up. Patients often tell us their legs feel fine on the weekend and miserable after a long shift.

• Aching, heaviness or a tired, full feeling in the calves
• Swelling around the ankles that leaves sock marks by evening
• Visible varicose veins or clusters of spider veins
• Leg cramps, especially at night, and restless legs
• Itching or burning over the veins or around the ankle
• Brown, red or purple discoloration of the lower leg skin
• Skin that feels thick, tight or leathery above the ankle
• Slow-healing sores near the inner ankle

Not everyone with CVI has bulging veins. Some people have significant reflux in veins that sit too deep to see, and their only clues are swelling, heaviness and skin changes. That is one reason an ultrasound is so valuable. You can read more about how symptoms show up on our vein disease symptoms page.

The Stages of Chronic Venous Insufficiency

Vein specialists use a standard classification, known as CEAP, to describe how far vein disease has progressed. It helps us track change over time and match treatment to severity.

CVI does not always march through every stage, and many people stay at an early stage for years. But once skin changes begin, they rarely reverse on their own, so earlier evaluation tends to give better results.

What Causes Chronic Venous Insufficiency?

The vein valves are thin, delicate flaps of tissue. Several things can weaken them or overwhelm them:

• Inherited valve weakness. CVI strongly runs in families. If a parent had varicose veins, your risk is higher.
• Pregnancy. Increased blood volume, hormonal changes and pressure from the uterus stretch the veins, and the effect can add up over several pregnancies.
• Long hours standing or sitting. Teachers, nurses, hairdressers, retail staff and office workers who rarely move their calves put steady strain on the valves.
• Excess weight. Extra pressure in the abdomen is transmitted down into the leg veins.
• A previous deep vein thrombosis. A clot can scar the deep vein valves, leading to post-thrombotic syndrome, a more stubborn form of CVI.
• Age and inactivity. Vein walls lose elasticity with age, and a weak calf muscle pump moves less blood.

Is Chronic Venous Insufficiency Serious?

For most people, CVI is not dangerous in the short term, but it is a real medical condition and not just a cosmetic one. Left untreated, it can lower quality of life through pain, swelling and poor sleep, and in its later stages it damages the skin. The complications we work hardest to prevent include:

• Venous ulcers, open wounds near the ankle that can take months to heal
• Superficial thrombophlebitis, painful clots in surface varicose veins
• Bleeding from thin-walled veins near the skin surface
• Skin infections such as cellulitis in swollen, fragile skin

How We Evaluate Chronic Venous Insufficiency

At Premier Vein & Vascular Center, a CVI evaluation is designed to answer three questions: which veins are leaking, how much, and what that means for your symptoms.

1. Focused history. We ask about your symptoms, how your day affects them, pregnancies, prior clots, medications and family history of vein disease.
2. Physical exam. We examine both legs standing, look for varicose veins, swelling and skin changes, and check the pulses in your feet.
3. Venous duplex ultrasound. In our IAC-accredited vascular lab, a registered technologist scans your leg veins while you stand or are tilted upright and measures how long blood flows backward through each valve. This test is painless and takes roughly 30 to 60 minutes. See our venous ultrasound page for details.
4. Arterial screening when needed. If pulses are weak or wounds are present, an ankle-brachial index confirms that arterial flow is adequate before strong compression is used.
5. A clear plan. We walk you through the ultrasound map, explain which veins are responsible and lay out the options, from conservative care to treatment.

Treatment Options for Chronic Venous Insufficiency

Conservative care

Graduated compression stockings, usually in the 20 to 30 mmHg range, support the veins and control swelling. Regular walking, calf raises, weight management and raising your legs above heart level for short periods during the day all reduce pressure in the lower veins. Conservative care relieves symptoms and is often required by insurance plans before procedures, but it does not repair the valves.

Minimally invasive vein procedures

When the ultrasound shows significant reflux in a superficial vein, closing that vein is the most direct way to lower pressure in the leg. Blood simply reroutes through healthy veins. Options include:

• Endovenous thermal ablation, using radiofrequency or laser energy delivered through a thin catheter
• Non-thermal ablation, which closes the vein with a medical adhesive or a chemical agent instead of heat
• Ultrasound-guided foam sclerotherapy for tortuous branches and veins feeding skin changes
• Ambulatory phlebectomy to remove large bulging surface veins through tiny nicks

These procedures are performed in the office under local anesthesia, usually in less than an hour. Most patients walk out on their own and return to normal light activity within a day or two, wearing compression for a short time afterward.

Living Well With CVI: Daily Habits That Help

Treatment works best when it is paired with habits that keep the calf muscle pump working. The calf is sometimes called the second heart of the leg, and you can strengthen it.

• Walk most days; even 20 to 30 minutes makes a difference
• If you sit or stand for work, flex your ankles and rise onto your toes every half hour
• Elevate your legs for 15 to 20 minutes after work
• Avoid very tight waistbands and long hot baths when legs are swollen
• Keep the skin of your lower legs moisturized to prevent cracking
• Put on compression stockings first thing in the morning, before swelling sets in

Simple exercises that strengthen the calf pump

You do not need a gym to help your veins. The calf muscle pump responds to simple, repeated movement, and a few minutes several times a day adds up. We often suggest these to patients with chronic venous insufficiency:

Heel raises: stand holding the back of a chair and rise slowly onto your toes, then lower down; aim for two or three sets of ten to fifteen. Ankle pumps: while sitting or lying, point your toes away and then pull them back toward you, twenty times in a row, several times a day; this is ideal at a desk or on a flight. Walking intervals: if long walks are hard, try three ten-minute walks spread through the day instead of one long one. Swimming and water walking: the pressure of the water supports the veins while the legs work, which many patients find especially comfortable in the Houston heat. Start gently, build up gradually, and stop if you develop chest pain, unusual shortness of breath or calf pain that does not settle with rest. These exercises will not repair damaged valves, but they make the remaining circulation work more efficiently and complement both compression and treatment.

If you already have skin changes or a healed ulcer around the ankle, ask us before starting a new exercise routine. Stiff ankles limit the calf pump, so gentle ankle range-of-motion work is often the first goal, and a physical therapist can help when mobility is limited by arthritis, balance problems or a previous injury.

When to See a Vein Specialist in Houston

If your legs ache, swell or feel heavy most evenings, if you see new varicose veins, or if the skin around your ankles is changing color or texture, it is time for an evaluation. A Houston vein specialist can tell you in a single visit whether CVI is the cause and how advanced it is. Dr. Syed Raza, a fellowship-trained interventional radiologist with more than 15 years of experience treating venous reflux, leads our team. Same-week appointments are usually available, and most insurance plans, including Medicare, cover evaluation and medically necessary treatment.

Frequently Asked Questions

Can chronic venous insufficiency be cured?

The damaged valves themselves do not repair, but the problem can be treated very effectively. Closing the leaking superficial veins with ablation or sclerotherapy removes the source of high pressure, and most patients see a major improvement in pain, heaviness and swelling.

What is the first sign of venous insufficiency?

For many people, the first sign is legs that feel heavy, achy or tired by the end of the day, often with mild ankle swelling. Visible varicose or spider veins are also common early signs, though some people have reflux without any visible veins.

Is walking good for chronic venous insufficiency?

Yes. Walking activates the calf muscle pump, which pushes blood up out of the legs and lowers vein pressure. Regular walking is one of the most helpful daily habits for people with CVI, alongside compression and leg elevation.

What is the difference between CVI and DVT?

Chronic venous insufficiency is a long-term problem with leaking vein valves that builds gradually. A deep vein thrombosis is a blood clot in a deep vein that develops suddenly and can be dangerous. A past DVT can damage valves and later cause CVI.

Does insurance cover treatment for venous insufficiency?

Most insurance plans, including Medicare, cover the evaluation and medically necessary treatment of CVI when symptoms are documented and an ultrasound confirms reflux. Some plans require a trial of compression stockings first, and our team can help check your coverage.

What happens if venous insufficiency is left untreated?

CVI tends to progress slowly. Over time, untreated reflux can lead to worsening swelling, skin discoloration and hardening, and eventually venous ulcers. Earlier treatment usually means simpler procedures and better long-term results.

Trusted Health Resources

1. Chronic Venous Insufficiency, Society for Vascular Surgery
2. Venous Insufficiency, MedlinePlus Medical Encyclopedia (NIH)
3. Varicose Veins and Spider Veins, MedlinePlus (NIH)