What Is Chronic Venous Insufficiency?

Chronic venous insufficiency (CVI) is a circulatory condition that develops when the one-way valves inside leg veins stop working properly. Under normal conditions, these valves keep blood moving upward toward the heart. When they weaken or become damaged, blood flows backward and pools in the lower legs – a process called venous reflux.

That pooled blood creates elevated pressure inside the veins. Over time, the pressure forces fluid out of the veins and into the surrounding tissue, causing swelling, a heavy sensation, aching, and in more advanced cases, skin changes or venous leg ulcers. CVI tends to develop gradually, often affecting adults over 40, and worsens with prolonged standing or sitting.^[3]

Common signs of vein disease symptoms linked to CVI include:

• Leg swelling, typically around the ankles and lower legs
• Aching, heaviness, or throbbing that worsens after standing
• Visible varicose veins or bulging surface veins
• Skin discoloration, thickening, or a brownish tone near the ankles
• Swelling that improves with leg elevation

What Is Lymphedema?

Lymphedema is a chronic condition involving the lymphatic system, a separate network of vessels and nodes that removes excess fluid from body tissues. When lymphatic vessels are damaged, blocked, or absent, fluid builds up in the tissues rather than draining normally.^[1]

Lymphedema is classified as primary (caused by a developmental problem with the lymphatic system) or secondary (caused by damage to the lymph nodes from surgery, radiation, infection, or trauma). Secondary lymphedema is more common in the United States and is frequently associated with cancer treatment that involves lymph node removal or radiation.

Key characteristics of lymphedema include:

• Swelling that often affects one limb more than the other
• Swelling that includes the foot or the entire limb, not just the ankle area
• Skin changes over time, including thickening or a firmer, drier texture
• Swelling that does not consistently improve with leg elevation
• Minimal direct pain from the swelling itself, especially early in the condition

Note: Lymphedema requires evaluation and care from a certified lymphedema therapist or lymphedema specialist. USA Vein Clinics specializes in treating venous conditions and does not provide lymphedema treatment. If you suspect lymphedema, a referral to a lymphedema specialist is the appropriate next step.

How Do Symptoms Compare?

Both conditions cause persistent leg swelling, which is why patients often confuse them or suspect one when they have the other. Several key differences can help point toward the more likely cause.

Swelling Pattern

With CVI, swelling is usually symmetric – both legs tend to be affected similarly, and the swelling is concentrated around the ankles and lower calves. It typically builds during the day and eases overnight, especially with leg elevation.

With lymphedema, swelling is more often asymmetric – one limb may be noticeably larger than the other, and the whole limb, including the foot, can be affected. Lymphedema swelling does not reliably reduce with rest or elevation, particularly as the condition progresses.

Pain and Discomfort

CVI typically produces aching, heaviness, or a throbbing feeling that worsens the longer you stand or sit. Elevating the legs often brings meaningful relief because it allows blood to drain back toward the heart against gravity.

Lymphedema in its early stages may produce little direct pain from the swelling itself. Discomfort, when present, tends to stem from the added weight of the limb or from joint stress over time rather than from the swelling directly.

Skin Changes

CVI is associated with skin discoloration – a reddish-brown or bronze staining around the ankles caused by iron deposits from broken-down red blood cells. Visible varicose veins, surface spider veins, and in advanced cases, venous leg ulcers are also characteristic of venous disease.

Lymphedema tends to cause skin thickening and a change in texture over time. In severe or long-standing cases, a condition called lymphostatic fibrosis can develop, giving the skin a firm, uneven appearance that is distinct from the discoloration pattern seen in CVI.

Response to Leg Elevation

Elevating the legs brings noticeable relief for most people with CVI. Because the swelling is driven by pooled blood, reducing venous pressure by raising the legs allows fluid to reabsorb.

Lymphedema does not respond the same way. Because the fluid is trapped in the tissues due to lymphatic system failure rather than venous pressure, elevating the limb provides limited or inconsistent relief as the condition advances.

Can You Have Both Conditions at Once?

Yes. Having both chronic venous insufficiency and lymphedema at the same time is more common than many patients realize. The combination is sometimes called phlebolymphedema.

CVI can contribute to secondary lymphedema over time. When venous pressure remains elevated, excess fluid continuously leaks into surrounding tissue. If this burden becomes too great for the lymphatic system to clear, lymphatic function can eventually become impaired. Research suggests that untreated CVI can progressively damage the lymphatic vessels, particularly in the later stages of venous disease.^[4]

This overlap is one reason why getting an accurate diagnosis matters. Treating only one system when both are affected may not resolve swelling fully. For people with significant CVI, vein treatment is typically the appropriate first step, as reducing venous pressure can also relieve the burden on the lymphatic system.

How Is Each Condition Diagnosed?

Diagnosing Chronic Venous Insufficiency

A vein specialist typically begins with a physical examination and a duplex ultrasound – a non-invasive imaging test that maps blood flow in the leg veins and identifies which valves are malfunctioning. This test is the cornerstone of CVI diagnosis and takes approximately 30 to 45 minutes. No needles or dye are required. You can review additional resources on leg swelling to understand whether your swelling pattern may point to a venous cause.

Diagnosing Lymphedema

Lymphedema is generally diagnosed through physical examination combined with a detailed medical history. Lymphoscintigraphy, a nuclear medicine imaging test, can assess lymphatic function but is not always required. A certified lymphedema therapist or lymphedema specialist typically manages the diagnostic process and treatment.

If you have both conditions, both types of assessment may be needed before a treatment plan can be developed.

How USA Vein Clinics Can Help with Venous Insufficiency

If you are experiencing leg swelling alongside aching, heaviness, or visible varicose veins, a vein specialist evaluation can determine whether CVI is the underlying cause. USA Vein Clinics offers minimally invasive vein treatments including endovenous laser therapy (EVLT), radiofrequency ablation (RFA), VenaSeal, Varithena, and ultrasound-guided sclerotherapy. These are outpatient procedures that do not require general anesthesia and involve minimal downtime.

A vein specialist can review your symptoms and perform a duplex ultrasound to see what is happening beneath the skin. If CVI is the source of your swelling, treatment may help reduce symptoms and improve your circulation and comfort.