Medically reviewed by Eric Hardee, M.D. · Updated October 2026
What Is Chronic Venous Insufficiency?
Chronic venous insufficiency (CVI) is a condition that occurs when the veins in your legs have difficulty returning blood to your heart. Healthy leg veins contain one-way valves that help blood flow upward against gravity. When these valves become damaged or stop working properly, blood can flow backward and pool in the lower legs.
Over time, this increased pressure in the veins can cause swelling, discomfort, skin changes, and, in more advanced cases, open sores called venous leg ulcers.
Chronic venous disease is common, and its symptoms can range from visible spider veins and varicose veins to persistent leg swelling and skin damage. CVI generally refers to more advanced disease involving swelling, skin changes, or venous ulcers.
Common signs of chronic venous insufficiency include:
- Heavy, aching, or tired legs
- Swelling in the feet, ankles, or lower legs
- Itching, cramping, or throbbing
- Enlarged, twisted varicose veins
- Darkened or thickened skin around the ankles
- Slow-healing wounds or venous leg ulcers
The good news is that chronic venous insufficiency can often be managed with the right treatment plan. At Texas Endovascular, our interventional radiologists evaluate venous conditions and help patients explore appropriate treatment options at our Houston and Dallas-area offices. Depending on the underlying cause and severity of your condition, treatment may include lifestyle changes, compression therapy, or a minimally invasive vein procedure.
What Are the Stages of Chronic Venous Insufficiency?
Chronic venous disease is commonly classified using the Clinical, Etiology, Anatomy, and Pathophysiology (CEAP) system. Its clinical classification ranges from C0 to C6, describing the visible signs of venous disease, from no visible changes to an active venous ulcer.
Understanding these classifications can help explain how venous disease may affect your legs over time. However, not everyone progresses through every stage, and symptoms do not always correspond directly to a particular classification.
C0: No Visible Signs of Venous Disease: There may be no visible or palpable signs of venous disease, even when a person experiences symptoms such as leg heaviness or aching.
C1: Spider Veins and Small Surface Veins: Small red, blue, or purple veins may become visible beneath the skin. These are commonly called spider veins. Spider veins do not necessarily indicate significant venous insufficiency, although they may sometimes occur alongside other vein problems.
C2: Varicose Veins: Varicose veins are enlarged, twisted veins that may bulge beneath the skin. They can cause aching, heaviness, itching, or discomfort, particularly after prolonged standing or sitting.
C3: Leg Swelling (Edema): When pressure builds within the veins, fluid can accumulate in the surrounding tissues. This may cause swelling in the ankles, feet, or lower legs, particularly after spending long periods on your feet. Learn more about leg swelling and lymphedema.
C4: Skin Changes: Ongoing venous pressure and inflammation can cause changes to the skin and underlying tissue. Symptoms may include brownish discoloration, eczema-like irritation, thickened skin, or hardened tissue around the lower legs and ankles.
C5: Healed Venous Leg Ulcer: A previously open venous ulcer has healed, although the underlying vein problem may remain. Without appropriate management, the wound may return.
C6: Active Venous Leg Ulcer: An open wound develops, often near the ankle or on the lower leg. Venous ulcers can be slow to heal and may cause pain, drainage, or skin irritation. They require appropriate medical evaluation and treatment to support healing and reduce the risk of complications.
The CEAP classification helps clinicians describe the signs of venous disease. A specialist may also use a physical examination and vascular ultrasound to determine the underlying problem and guide treatment.
What Causes Chronic Venous Insufficiency?
Chronic venous insufficiency develops when the veins cannot return blood effectively from the legs to the heart. This may happen because the vein valves are damaged, the veins are obstructed, or a combination of problems affects circulation.
Several factors can increase your risk of developing chronic venous disease, including:
- Age: Vein problems become more common as you get older.
- Family history: Having close relatives with varicose veins or venous disease may increase your risk.
- Previous blood clots: Deep vein thrombosis (DVT) can damage vein valves and interfere with normal blood flow.
- Varicose veins: Enlarged veins may be associated with underlying valve dysfunction.
- Pregnancy: Hormonal changes and increased pressure on the veins can contribute to venous disease.
- Prolonged sitting or standing: Remaining in one position for extended periods can contribute to blood pooling in the legs.
- Limited mobility: Reduced movement can make it harder for the calf muscles to help return blood to the heart.
- Excess body weight: Additional pressure on the veins can contribute to venous problems.
- Smoking: Smoking harms blood vessel health and is an important modifiable vascular risk factor.
What Are the Symptoms of Chronic Venous Insufficiency?
Symptoms of chronic venous insufficiency can vary depending on the underlying vein problem and how much it affects circulation. Some people notice visible veins first, while others experience discomfort or swelling before significant skin changes appear.
Common CVI symptoms include:
- Heavy, tired, or aching legs
- Throbbing or cramping in the lower legs
- Swelling in the feet and ankles
- Itching or irritated skin
- Discomfort that worsens after prolonged standing or sitting
- Spider veins or varicose veins
- Brown, reddish, or darkened skin around the ankles
- Thickened or hardened skin on the lower legs
- Slow-healing wounds or venous leg ulcers
Symptoms may become more noticeable toward the end of the day or after standing for long periods. Elevating your legs may provide temporary relief, but persistent or worsening symptoms should be evaluated.
How Is Chronic Venous Insufficiency Diagnosed?
Diagnosing chronic venous insufficiency typically begins with a review of your symptoms, medical history, and a physical examination of your legs.
Your specialist may recommend a duplex ultrasound, a noninvasive imaging test that evaluates blood flow through your veins. This test can help identify abnormal backward blood flow, known as venous reflux, as well as signs of obstruction or other vein problems.
The findings help your specialist determine whether venous insufficiency is present, identify the veins involved, and recommend an appropriate treatment plan.
How Can You Manage or Help Prevent Venous Insufficiency?
Although not all cases of chronic venous insufficiency can be prevented, certain habits can support circulation, relieve symptoms, and help manage the condition.
- Stay Physically Active: Walking and other activities that engage your calf muscles help move blood through the veins and back toward your heart. If you sit or stand for extended periods, take regular breaks to move around.
- Elevate Your Legs: Raising your legs above the level of your heart when practical can help reduce swelling by encouraging blood and fluid to move out of the lower extremities.
- Consider Compression Stockings: Compression stockings apply graduated pressure to the legs, helping improve venous return and manage swelling. Your specialist can advise whether compression is appropriate for you and recommend the correct type and fit.
- Maintain a Healthy Weight: If appropriate for you, maintaining a healthy weight may help reduce pressure on the veins and support overall vascular health.
- Protect Your Skin: Chronic venous disease can make the skin around your ankles and lower legs dry, irritated, or fragile. Use a gentle moisturizer to help maintain the skin barrier, and avoid aggressive exfoliation or anything that could injure the skin.
When Should You Seek Treatment for Chronic Venous Insufficiency?
Consider scheduling a vein evaluation if you experience any of the following:
- Persistent leg swelling: Swelling that repeatedly develops or worsens throughout the day may indicate a circulation problem.
- Heavy, aching, or tired legs: Ongoing discomfort, particularly after prolonged standing or sitting, may be associated with venous disease.
- Bulging or enlarging veins: Visible varicose veins may indicate underlying venous reflux, especially when accompanied by pain, heaviness, or swelling.
- Skin discoloration or thickening: Brownish discoloration, irritation, or changes in the skin around your ankles can be signs of more advanced venous disease.
- A wound that will not heal: A slow-healing wound near the ankle or on the lower leg may be a venous ulcer and should be evaluated promptly.
- Redness, warmth, or a painful, firm vein: These symptoms can occur with superficial thrombophlebitis, which involves inflammation and sometimes clotting in a superficial vein. Medical evaluation is important to determine the cause and rule out more serious problems.
Seek urgent medical attention for sudden or significant leg swelling, particularly when accompanied by pain, warmth, or redness, because these can be signs of deep vein thrombosis. Chest pain, sudden shortness of breath, or coughing up blood can indicate a pulmonary embolism and require emergency medical care.
Early evaluation can help identify venous disease before complications develop and clarify which treatment options may be appropriate.
Chronic Venous Insufficiency Treatment in Houston and Dallas
Treatment for chronic venous insufficiency depends on the cause of the condition, the veins involved, your symptoms, and whether complications such as skin changes or venous ulcers have developed.
At Texas Endovascular, our interventional radiologists evaluate venous conditions and discuss appropriate treatment options based on your individual needs. Depending on your diagnosis, treatment may include conservative measures or a minimally invasive procedure to address abnormal blood flow.
Conservative Treatment
For some patients, treatment begins with walking, leg elevation, compression therapy, and other measures to help manage symptoms and reduce swelling. These approaches may be particularly useful for symptom relief, but they do not necessarily correct the underlying cause of venous reflux.
Minimally Invasive Vein Procedures
When an underlying vein problem requires intervention, a specialist may recommend a minimally invasive procedure to treat the affected veins. The appropriate approach depends on the location and type of venous dysfunction identified during your evaluation.
Depending on your diagnosis, available procedures may include treatments that close an incompetent vein or address problematic varicose veins. Your specialist can explain the potential benefits, risks, alternatives, and expected recovery associated with each recommended option.
Medications and Wound Care
Medication is not routinely required for every patient with CVI. Treatment depends on the specific symptoms and complications involved. For example, anticoagulants are used when indicated for blood clots, rather than as a routine treatment for venous insufficiency itself.
Patients with venous ulcers may require specialized wound care, compression when appropriate, and evaluation for treatment of the underlying venous problem. Your specialist will review your findings and help determine the most appropriate plan for your condition.
Find Chronic Venous Insufficiency Treatment Near You
You do not have to ignore persistent leg swelling, discomfort, or changes in your veins and skin. A professional evaluation can help determine whether chronic venous insufficiency is contributing to your symptoms and whether treatment may help.
Texas Endovascular serves patients throughout the Houston and Dallas areas, offering specialized evaluation and treatment for a range of vascular conditions.
Schedule an appointment with Texas Endovascular to discuss your symptoms and explore your options for vein care.
