Chronic venous insufficiency occurs when damage to your leg veins disrupts blood flow back up to your heart. Normally, the valves in your veins make sure that blood flows toward your heart. But when these valves don't work well, blood can also flow backward. This can cause blood to collect (pool) in your legs.

Chronic venous insufficiency is not a serious health threat. But it can be painful and disabling.

The causes of chronic venous insufficiency include:

• High blood pressure in the leg veins over time, due to sitting or standing for long periods.
• Lack of exercise.
• Smoking.
• A blood clot in a deep vein, often in the calf or thigh (deep vein thrombosis).
• Swelling and inflammation of a vein close to the skin, often in the legs (phlebitis).

You are more at risk for this condition if you:

• Have extra weight or obesity.
• Are pregnant.
• Have a family history of it.
• Have had damage to your leg because of injury, surgery, or previous blood clots.

Symptoms of chronic venous insufficiency may include:

• Swelling in your legs or ankles.
• A tight feeling in your calves or itchy, painful legs.
• Pain when walking that stops when you rest.
• Brown-colored skin, often near the ankles.
• Varicose veins.
• Open sores on the legs (leg ulcers) that are sometimes hard to treat.
• Recurrent leg skin infections.
• An uncomfortable feeling in your legs and an urge to move your legs (restless legs syndrome).
• Painful leg cramps or muscle spasms (charley horse).

These symptoms may seem like other health problems. Talk with your doctor for a diagnosis.

Your doctor will take your health history and give you an exam. You may also have an imaging test called a Duplex ultrasound. This looks at blood flow and the structure of your leg veins. It checks the speed and direction of blood flow in the blood vessel.

Treatment will depend on your symptoms, age, and general health. It will also depend on how severe the condition is. Treatment may include the following.

Keeping your legs raised (elevated), wearing compression stockings, good skin care, healthy body weight, and exercising regularly may help.

Medicines that increase blood flow through the vessels may be used along with compression therapy to help heal leg ulcers. Aspirin can also be used to help ulcers heal. Medicines that draw excess fluid from the body through the kidneys (diuretics) are not often used. But they may be taken if other conditions, such as heart failure or kidney disease, are also linked to the swelling.

This may be used if you have spider veins or small varicose veins. A chemical is injected into the affected veins. The chemical causes scarring in the veins so that they can no longer carry blood. Blood then returns to the heart through other veins. The body absorbs the scarred veins.

This is a minimally invasive procedure. A tube (catheter) puts heat right into the affected vein. This closes the vein. Once the vein is closed, less blood pools in the leg. Overall blood flow is improved.

This is done in severe cases. Ligation is a type of surgery that may be used. The affected vein is tied off so that blood no longer flows through it. If the vein or its valves are heavily damaged, the vein will be removed. This is called vein stripping.

• Chronic venous insufficiency occurs when your leg veins don't allow blood to flow back up to your heart.
• Symptoms include pain, swelling, cramps, and skin changes.
• Some common causes are having excess weight and damage to a leg, such as from an injury or blood clot.
• An imaging test called a Duplex ultrasound can diagnose it.
• Compression socks and medicines may work for milder cases. More serious cases may need sclerotherapy or surgery.

Tips to help you get the most from a visit to your doctor:

• Know the reason for your visit and what you want to happen.
• Before your visit, write down questions you want answered.
• Bring someone with you to help you ask questions and remember what your doctor tells you.
• At the visit, write down the name of a new diagnosis and any new medicines, treatments, or tests. Also write down any new instructions your doctor gives you.
• Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported.
• Ask if your condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if you do not take the medicine or have the test or procedure.
• If you have a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your doctor if you have questions, including after office hours and on weekends and holidays.