Venous Disease

CVI Explained (Chronic Venous Insufficiency)

Healthy leg veins have valves that keep blood flowing to the heart. Chronic venous insufficiency develops when the valves stop working properly and allow blood to flow backward (i.e. reflux) and pool in the lower leg veins. If chronic venous insufficiency is left untreated, symptoms can worsen over time.

Chronic venous insufficiency may cause the following symptoms in your legs¹:


  • Varicose veins
  • Aching
  • Swelling
  • Cramping
  • Heaviness or tiredness
  • Itching
  • Open skin sores
  • Restlessness

 Chronic Venous Insufficiency

CVI, one of the underlying causes of venous ulcers, is a potentially serious and progressive medical condition.  Symptoms can worsen over time if left untreated.

Chronic venous insufficiency is 2 times more prevalent than coronary heart disease (CHD) and 5 times more prevalent than peripheral arterial disease (PAD).

  • Varicose veins may be more than just a cosmetic issue
  • Varicose veins are not the same as spider veins (visit our Glossary of Terms page here to find out more about spider veins)
  • Varicose veins affect BOTH men and women
  • To locate a vein specialist in your area, please visit our Find a Doctor Physician Locator.

Who is at Risk for CVI

CVI can affect anyone; gender and age are factors that may increase your risk.³  For example, women older than 50 are more likely than others to develop CVI.  Other factors that may increase your risk, include:

  • Family history
  • Sedentary lifestyle
  • Trauma
  • Prolonged Standing
  • Obesity or excess weight
  • Current or previous pregnancies
  • Smoking


For mild forms of CVI, lifestyle changes may be recommended to control existing symptoms and prevent others. The following measures may help prevent varicose veins and CVI:4

  • Manage body weight
  • Exercise regularly, focusing on exercises that work your legs (run or walk)
  • Elevate your legs whenever possible
  • Avoid prolonged standing or sitting
  • Avoid clothes that are tight around the waist, groin or legs
  • Avoid shoes that limit use of calf muscles (i.e., high heels)
  • Eat a diet low in salt and rich in high-fiber foods



Varicose veins are often misunderstood as a cosmetic problem and many people living with them do not seek treatment.  The good news is that there are minimally invasive treatment options available for varicose veins and CVI.

  • The ClosureFast™ procedure uses controlled and consistent heat delivered by the ClosureFast™ catheter to seal the diseased vein.  Once the vein is sealed, blood is rerouted to nearby healthy veins.
  • The ClosureFast™ procedure has been rigorously tested and proven across multiple studies and patients.5-8
  • The VenaSeal™ closure system delivers a small amount of proprietary medical adhesive to the diseased vein.  The adhesive seals the vein and blood is rerouted through nearby healthy veins.
  • Three clinical studies demonstrate results that support the clinical safety and effectiveness of the VenaSeal™ closure system.9-11

Your doctor can help you decide which treatment option is best for you.  To locate a vein specialist in your area, please visit our Find a Doctor Physician Locator.