Edema

Overview

Edema is swelling caused by too much fluid trapped in the body's tissues. Edema can affect any part of the body. But it's more likely to show up in the legs and feet.

Medicines and pregnancy can cause edema. It also can be the result of a diseasesuch as congestive heart failurekidney diseasevenous insufficiency or cirrhosis of the liver.

Wearing compression garments and reducing salt in the diet often relieves edema. When a disease causes edemathe disease needs treatmentas well.

Symptoms

Edema in foot and ankle Enlarge image

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Edema in foot and ankle

Edema in foot and ankle

Swelling of the footankle and leg can be bad enough to leave a dimplealso known as a pitin the skin after pressing on the area. This swellingcalled edemais the result of too much fluid in the tissues. Congestive heart failure or the vein not working wellalso known as venous insufficiencyis often the cause.

Symptoms of edema include:

• Swelling or puffiness of the tissue right under the skinespecially in legs or arms.
• Stretched or shiny skin.
• Skin that holds a dimplealso known as pittingafter it's been pressed for a few seconds.
• Swelling of the bellyalso called the abdomenso that it's bigger than usual.
• Feeling of leg heaviness.

When to see a doctor

Make an appointment to see a health care provider for swellingstretched or shiny skinor skin that holds a dimple after being pressed. See a provider right away for:

• Shortness of breath.
• Irregular heartbeat.
• Chest pain.

These can be signs of fluid buildup in the lungsalso known as pulmonary edema. It can be life-threatening and needs quick treatment.

After sitting for a long timesuch as on a long flightcall your care provider if you get leg pain and swelling that won't go away. Especially if the pain and swelling is on one sidethese can be symptoms of a blood clot deep in the veinalso known as deep vein thrombosisor DVT.

Causes

Edema occurs when tiny blood vessels in the bodyalso known as capillariesleak fluid. The fluid builds up in nearby tissues. The leak leads to swelling.

Causes of mild cases of edema include:

• Sitting or staying in one position for too long.
• Eating too much salty food.
• Being premenstrual.
• Being pregnant.

Edema also can be a side effect of some medicines. These include:

• High blood pressure medicines.
• Nonsteroidal anti-inflammatory medicines.
• Steroid medicines.
• Estrogens.
• Certain diabetes medicines called thiazolidinediones.
• Medicines use to treat nerve pain.

Sometimes edema can be a sign of a more serious condition. Illnesses that can cause edema include:

• Congestive heart failure. Congestive heart failure causes one or both of the heart's lower chambers stop pumping blood well. As a resultblood can back up in the legsankles and feetcausing edema.

  Congestive heart failure can also cause swelling in the stomach area. This condition also can cause fluid to build up in the lungs. Known as pulmonary edemathis can lead to shortness of breath.

• Liver damage. This liver damage from cirrhosis can cause fluid to build up in the stomach area. and in the legs. This fluid buildup in the stomach area is known as ascites.
• Kidney disease. Kidney disease can cause fluid and salts in the blood to build up. Edema linked to kidney disease usually occurs in the legs and around the eyes.
• Kidney damage. Damage to the tinyfiltering blood vessels in the kidneys can result in nephrotic syndrome. In nephrotic syndromedecreased levels of protein in the blood can lead to edema.
• Weakness or damage to veins in your legs. This conditionknown as chronic venous insufficiencyharms the one-way valves in the leg. One-way valves keep blood flowing in one direction. Damage to the valves allows blood to pool in the leg veins and causes swelling.
• Deep vein thrombosisalso called DVT. Sudden swelling in one leg with pain in the calf muscle can be due to a blood clot in one of the leg veins. DVT requires medical help right away.
• Problems with the system in the body that clears extra fluid from tissues. If the body's lymphatic system is damagedsuch as by cancer surgerythe lymphatic system might not drain well.
• Severelong-term lack of protein. An extreme lack of protein in the diet over time can lead to edema.

Risk factors

The following increases the risk of edema:

• Being pregnant.
• Taking certain medicines.
• Having a long-lasting illnesssuch as congestive heart failure or liver or kidney disease.
• Having surgery that involves a lymph node.

Complications

If left untreatededema can cause:

• Swelling that gets more and more painful.
• Problems walking.
• Stiffness.
• Stretched skinwhich can itch.
• Increased risk of infection in the swollen area.
• Scarring between layers of tissue.
• Less blood flow.
• Less ability of the of arteriesveinsjoints and muscles to stretch.
• Increased risk of skin ulcers.