Skip to content
My WebMD Sign In, Sign Up

Heart Failure Health Center

Font Size

Edema Overview

Edema is the medical term for swelling. It is a general response of the body to injury or inflammation. Edema can be isolated to a small area or affect the entire body. Medications, infections, pregnancy, and many medical problems can cause edema.

Edema results whenever small blood vessels become "leaky" and release fluid into nearby tissues. The extra fluid accumulates, causing the tissue to swell.

Recommended Related to Heart Failure

Heart Failure and Caregiver Burnout

Caregiver burnout is a state of physical, emotional, and mental exhaustion that may be accompanied by a change in attitude -- from positive and caring to negative and unconcerned. Burnout can occur when caregivers don't get the help they need, or if they try to do more than they are able -- either physically or financially. Caregivers who are "burned out" may experience fatigue, stress, anxiety, and depression. Many caregivers also feel guilty if they spend time on themselves rather than on their...

Read the Heart Failure and Caregiver Burnout article > >

Causes of Edema

Edema is a normal response of the body to inflammation or injury. For example, a twisted ankle, a bee sting, or a skin infection will all result in edema in the involved area. In some cases, such as in an infection, this may be beneficial. Increased fluid from the blood vessels allows more infection-fighting white blood cells to enter the affected area.

Edema can also result from medical conditions or problems in the balance of substances normally present in blood. Some of the causes of edema include:

Low albumin (hypoalbuminemia): Albumin and other proteins in the blood act like sponges to keep fluid in the blood vessels. Low albumin may contribute to edema, but isn't usually the sole cause.

Allergic reactions: Edema is a usual component of most allergic reactions. In response to the allergic exposure, the body allows nearby blood vessels to leak fluid into the affected area.

Obstruction of flow: If the drainage of fluid from a body part is blocked, fluid can back up. A blood clot in the deep veins of the leg can result in leg edema. A tumor blocking lymph or blood flow will cause edema in the affected area.

Critical illness: Burns, life-threatening infections, or other critical illnesses can cause a whole-body reaction that allows fluid to leak into tissues almost everywhere. Widespread edema throughout the body can result.

Edema and heart disease (congestive heart failure): When the heart weakens and pumps blood less effectively, fluid can slowly build up, creating leg edema. If fluid buildup occurs rapidly, fluid in the lungs (pulmonary edema) can develop.

Edema and liver disease: Severe liver disease (cirrhosis) results in an increase in fluid retention. Cirrhosis also leads to low levels of albumin and other proteins in the blood. Fluid leaks into the abdomen (called ascites), and can also produce leg edema.

Edema and kidney disease: A kidney condition called nephrotic syndrome can result in severe leg edema, and sometimes whole-body edema (anasarca).

Edema and pregnancy: Due to an increase in blood volume during pregnancy and pressure from the growing womb, mild leg edema is common during pregnancy. However, serious complications of pregnancy such as deep vein thrombosis and preeclampsia can also cause edema.

Cerebral edema (brain edema): Swelling in the brain can be caused by head trauma, low blood sodium (hyponatremia), high altitude, brain tumors, or an obstruction to fluid drainage (hydrocephalus). Headaches, confusion, and unconsciousness or coma can be symptoms of cerebral edema.

Medications and edema: Numerous medications can cause edema, including:

Most commonly, these medications produce no edema, or mild leg edema.

WebMD Medical Reference

Today on WebMD

Compressed heart
Article
Salt Shockers
Slideshow
 
Inside A Heart Attack
Slideshow
lowering blood pressure
SLIDESHOW
 

Mechanical Heart
Article
Omega 3 Overview Slideshow
Slideshow
 
Atrial Fibrillation Guide
Slideshow
Simple Steps to Lower Cholesterol
Slideshow
 

Compressed heart
Article
FAQ Heart Failure
Article
 
Cholesterol Confusion
Health Check
Resolved To Quit Smoking
Slideshow
 

WebMD Special Sections