Chronic Venous Insufficiency (CVI): Symptoms, Causes and UK Management

Chronic Venous Insufficiency (CVI) is a long-term condition where the valves in the leg veins do not work effectively. In a healthy circulatory system, these valves ensure that blood flows in one direction—upwards towards the heart. When these valves become damaged or weakened, blood can pool in the lower legs, a process known as venous stasis.

In the UK, CVI is a common condition, often associated with varicose veins, but it can occur independently. According to NICE (National Institute for Health and Care Excellence) guidelines, CVI is part of a spectrum of venous diseases that, if left unmanaged, can progress from mild swelling to chronic skin changes and difficult-to-heal ulcers. Understanding the early signs is essential for maintaining mobility and skin integrity.

The symptoms of CVI often worsen throughout the day, particularly if you spend long periods standing or sitting still. Patients typically report a heavy or 'bursting' sensation in the calves. Common clinical signs include:

• Oedema: Swelling in the ankles and lower legs that typically improves after a night’s sleep.
• Leg Aching: A dull, persistent throb or cramping sensation in the legs.
• Skin Changes: The skin may become reddish-brown, leathery, or itchy (often called venous eczema).
• Varicose Veins: Enlarged, twisting veins that are visible beneath the skin surface.
• Restless Legs: An uncomfortable urge to move the legs, especially in the evening.

If you notice the skin around your ankles becoming tight, shiny, or discoloured, it is important to seek medical advice to prevent the development of open sores.

Several factors can lead to the weakening of vein valves. One of the most significant causes is a history of Deep Vein Thrombosis (DVT); when a clot damages a valve, it can lead to 'post-thrombotic syndrome,' a form of CVI. Other risk factors include:

• Age and Gender: The risk increases as we age, and women are statistically more likely to develop the condition, partly due to hormonal changes.
• Pregnancy: Increased blood volume and pressure on pelvic veins can damage leg valves.
• Obesity: Carrying excess weight puts significant pressure on the venous system.
• Lifestyle: Occupations that require prolonged standing (e.g., retail or nursing) or a sedentary lifestyle with little calf muscle activation.
• Family History: There is often a genetic predisposition to weak vein walls.

Management of CVI in the UK follows established NICE pathways, focusing on improving blood flow and reducing venous pressure. The first line of treatment is typically conservative management:

Compression Therapy

Medical-grade compression stockings are the cornerstone of CVI treatment. They apply graded pressure—tightest at the ankle—to help push blood back up the leg. It is vital to be measured professionally for these, as the wrong size can be ineffective or even harmful.

Lifestyle Modifications

Patients are encouraged to elevate their legs above the level of the heart several times a day. Regular walking is also essential, as the 'calf muscle pump' acts as a secondary heart, squeezing the veins to move blood upwards. Weight management and smoking cessation also play a critical role in reducing systemic vascular pressure.

Surgical and Endovascular Options

If conservative measures fail, an NHS vascular specialist may recommend procedures such as endothermal ablation (using heat to seal the vein) or ultrasound-guided foam sclerotherapy to redirect blood flow to healthier veins.

If CVI is not managed, the persistent high pressure in the veins can cause fluid and blood cells to leak into the surrounding tissue. This leads to inflammatory changes that can cause the skin to break down, resulting in a venous leg ulcer. These ulcers are often painful, may weep fluid, and are prone to infection.

Proper wound care involves specialized dressings and high-compression bandaging. Because these ulcers can take months to heal and frequently recur, the UK health system prioritizes prevention through early diagnosis of underlying venous insufficiency.

If you are worried about leg swelling or changes in the appearance of your skin, you can speak to a GP online for an initial assessment. An online consultation is a convenient way to discuss your symptoms, review your medical history, and receive evidence-based advice on self-care.

During a video or photo-based consultation, a doctor can help determine if your symptoms suggest CVI or another condition, such as heart failure or lymphedema. They can provide advice on the correct strength of compression stockings and, if necessary, provide a referral for a formal Doppler ultrasound scan at a local clinic to map your blood flow. Managing your condition online allows for quick access to professional guidance without the wait times often associated with in-person surgeries.