Chronic venous insufficiency (CVI) is a condition in which the veins in the legs have trouble returning blood to the heart. It usually occurs when the valves inside the veins become weakened or damaged, allowing blood to pool in the lower legs instead of flowing upward efficiently.

Over time, that pressure can lead to leg heaviness, swelling, aching, varicose veins, skin changes, and, in more advanced cases, wounds around the lower leg or ankle. Chronic venous insufficiency is common, but it should not be ignored. The earlier it is evaluated, the easier it may be to manage symptoms and reduce the risk of progression.

CVI is not the same as a blood clot, but some symptoms can overlap. Sudden one-sided swelling, calf pain, warmth, redness, chest pain, or shortness of breath should be treated as urgent symptoms.

How Healthy Leg Veins Work

Your leg veins have a difficult job. They move blood upward, against gravity, from the legs back toward the heart. To do this, they rely on two main systems:

• One-way valves inside the veins
• Calf muscle movement that helps push blood upward when you walk

When you walk, your calf muscles squeeze the veins and help move blood toward the heart. The valves then close to stop blood from falling backward.

When those valves stop closing properly, blood can leak backward and collect in the lower legs. This creates pressure inside the veins and leads to the symptoms associated with chronic venous insufficiency.

What Causes Chronic Venous Insufficiency?

Chronic venous insufficiency develops when vein valves become weak, stretched, or damaged. In some people, this happens gradually over time. In others, it may be related to a history of blood clots, vein injury, or long-term pressure in the leg veins.

Common causes and risk factors include:

• Family history of vein disease
• Varicose veins
• Aging
• Pregnancy
• Hormonal changes
• Long periods of standing or sitting
• Excess weight
• Limited movement
• Prior blood clots
• Prior leg injury or vein procedures

Not everyone with these risk factors develops CVI, but they can increase the chance of valve problems and venous reflux.

Chronic Venous Insufficiency Symptoms

CVI symptoms often build slowly. Many people first notice that their legs feel tired or heavy at the end of the day. Over time, swelling, visible veins, and skin changes may become more noticeable.

Common symptoms include:

• Heavy or tired legs
• Aching, throbbing, or pressure
• Swelling around the ankles or lower legs
• Varicose veins
• Spider veins that spread or return after treatment
• Itching or burning skin
• Night cramps
• Restless legs
• Brownish discoloration near the ankles
• Dry, irritated, or thickened skin
• Slow-healing sores near the ankle

Symptoms often get worse after standing or sitting for long periods and may improve with walking, leg elevation, or compression.

How Chronic Venous Insufficiency Progresses

Stage	What You May Notice	What Is Happening
Early	Heaviness, fatigue, mild swelling	Vein valves begin to weaken, allowing some blood to flow backward and pool in the legs.
Developing	Varicose veins, aching, itching	Blood pooling increases pressure inside the veins, causing symptoms to become more noticeable.
Moderate	Persistent swelling and skin changes	Ongoing pressure affects the surrounding tissues and skin, leading to inflammation and discoloration.
Advanced	Thickened skin and leg ulcers	Poor circulation and chronic inflammation impair the skin’s ability to heal properly.

Chronic Venous Insufficiency vs. Varicose Veins

Varicose veins and chronic venous insufficiency are closely related, but they are not exactly the same thing.

Chronic venous insufficiency, or CVI, happens when the veins in the legs have trouble moving blood back toward the heart. When the valves inside the veins do not work properly, blood can pool in the legs and increase pressure inside the veins.

Varicose veins can be one visible symptom of that pressure. As blood pools and vein pressure rises, some veins may stretch, enlarge, and become twisted or raised under the skin.

However, not everyone with varicose veins has significant chronic venous insufficiency, and not everyone with CVI develops visible varicose veins. Some patients may have aching, heaviness, swelling, skin changes, or other symptoms of venous disease without obvious bulging veins.

Is It Chronic Venous Insufficiency or Lymphedema?

Leg swelling is not always caused by venous disease. Another possible cause is lymphedema, which happens when lymph fluid does not drain properly and builds up in the tissues.

CVI and lymphedema affect different systems in the body. CVI involves blood flow through the veins, while lymphedema affects the lymphatic system, which helps remove excess fluid from the tissues.

Because both conditions can cause leg swelling, they may sometimes be confused with one another. They can also occur together. Long-standing venous disease may place extra strain on the lymphatic system, so some patients have swelling caused by both venous reflux and poor lymphatic drainage.

A vein ultrasound can help show whether a vein problem is contributing to the swelling. If the veins are working normally but the swelling continues, your provider may look at other possible causes, including lymphedema

Signs That Swelling May Involve the Lymphatic System

Lymphedema may be considered when swelling:

• Involves the foot or toes
• Lasts throughout the day
• Does not improve much with elevation
• Feels firm or heavy
• Causes tightness in the skin
• Is present even without visible varicose veins

These signs do not mean that you have lymphedema, but they do suggest that persistent swelling should be evaluated carefully to determine the underlying cause.

How Chronic Venous Insufficiency Is Diagnosed

A vein evaluation usually starts with a discussion of your symptoms, medical history, and risk factors. Your provider may ask when swelling occurs, whether symptoms improve with elevation, whether you have had blood clots, and whether varicose veins run in your family.

A duplex ultrasound may be used to confirm whether reflux is present. This non-invasive test uses sound waves to show vein structure and blood flow. It can show whether valves are closing properly and which veins are involved.

Duplex ultrasound is a key diagnostic tool as visible veins do not necessarily mean that you see the reason for your condition, and treating the visible problem without identifying the reflux is a short-term treatment. Finding and treating the underlying reflux is the key to achieving results that last.

Treatment Options for Chronic Venous Insufficiency

Treatment depends on symptoms, ultrasound findings, health history, and the severity of the condition. Not every patient needs a procedure, but persistent symptoms should be evaluated.

Conservative Care

Conservative care may help reduce pressure in the leg veins and manage symptoms.

Common recommendations include:

• Walking regularly
• Elevating the legs when possible
• Avoiding long periods of standing or sitting
• Wearing compression stockings when recommended
• Maintaining a healthy weight
• Doing calf-pump exercises during travel or desk work

Compression can help with swelling and heaviness, but it does not repair faulty valves. If reflux is significant, additional treatment may be discussed.

Minimally Invasive Vein Treatment

When reflux is present, treatment may focus on closing the refluxing vein so blood can reroute through healthier veins. Modern vein procedures are often done in the office with little downtime.

Depending on your anatomy and the veins involved, treatment options may include:

• Radiofrequency ablation
• VenaSeal™ vein closure
• Ultrasound-guided foam sclerotherapy
• Microphlebectomy for bulging surface veins
• Sclerotherapy for remaining spider or smaller veins

Your provider will recommend the option that fits your vein anatomy, symptoms, and treatment goals.

What Happens If CVI Is Left Untreated?

Chronic venous insufficiency can worsen over time. Not every person will develop advanced disease, but untreated reflux can increase pressure in the leg veins and contribute to ongoing symptoms.

Possible complications include:

• Worsening swelling
• More visible varicose veins
• Skin irritation or itching
• Brown discoloration near the ankles
• Thickened or hardened skin
• Inflammation
• Slow-healing wounds
• Venous ulcers near the ankle

Early evaluation can help identify the source of the problem before symptoms become harder to manage.

When to See a Doctor

Consider scheduling a vein evaluation if you have:

• Leg heaviness that worsens through the day
• Swelling around the ankles or lower legs
• Varicose veins
• Skin discoloration near the ankles
• Itching, burning, or irritation in the lower legs
• Night cramps or restless legs
• Spider veins that keep spreading or returning
• A sore near the ankle that is slow to heal

Seek urgent medical care if you develop sudden one-sided swelling, new calf pain, warmth, redness, chest pain, shortness of breath, or coughing up blood. These symptoms can point to a blood clot or pulmonary embolism and should be evaluated right away.

Get Answers About Leg Swelling and Vein Symptoms

Have you been experiencing leg heaviness, leg swelling, pain, or the formation of varicose veins? Chronic venous insufficiency may be contributing to your symptoms. A vein evaluation can show whether reflux is present and help determine which treatment options make sense. 

Call Vein Institute now to book an appointment today. We can evaluate your symptoms and recommend what would be the best action plan for your legs.

Frequently Asked Questions About Chronic Venous Insufficiency

What is chronic venous insufficiency?

Chronic venous insufficiency is a long-term vein condition where the valves in the leg veins do not close properly. Blood then flows backward and pools in the legs, causing pressure, swelling, heaviness, aching, varicose veins, and skin changes.

Is chronic venous insufficiency serious?

This condition is usually controllable; however, without proper treatment, venous reflux may result in progressive swelling, darkening of the skin, inflammation, and venous ulcerations.

What does chronic venous insufficiency feel like?

People who suffer from this condition complain about heaviness, aching, throbbing, pressure, swelling, or fatigue in their legs. Usually, symptoms are aggravated due to prolonged standing or sitting.

Can chronic venous insufficiency cause lymphedema?

CVI is not connected to lymphedema; however, these two diseases may happen simultaneously. Chronic venous disease leads to increased pressure on the mechanism of fluid drainage in the legs. There are cases of edema that are caused by venous reflux and lymphedema.

How is chronic venous insufficiency diagnosed?

CVI is commonly diagnosed with a clinical evaluation and duplex ultrasound. The ultrasound checks blood flow and shows whether vein valves are allowing reflux.

Can chronic venous insufficiency go away on its own?

CVI usually does not go away on its own because damaged vein valves do not typically repair themselves. Symptoms can often be managed, and vein treatments may help address reflux when present.

Does compression fix chronic venous insufficiency?

While compression can help to relieve swelling, heaviness, and pain, it does not heal the damaged valves. In case there is significant reflux, you will be advised on other treatment methods.

What is the best treatment for chronic venous insufficiency?

The best treatment depends on which veins are involved, your symptoms, and your ultrasound findings. Treatment may include compression, lifestyle changes, or minimally invasive procedures that close refluxing veins.