Edema (water retention) is swelling caused by an excessive accumulation of fluid in the body. It typically affects the hands, feet, arms, ankles and legs, but can develop in any part of the body. The lower legs are particularly susceptible to edema due to the force of gravity.
Normally, the kidneys filter the blood and help to maintain a proper metabolic balance. However, under certain conditions, too much fluid is retained and swelling results. Mild edema may be inconsequential, but because fluid buildup can result from a more serious medical condition, a physician should be consulted when symptoms are more severe or prolonged.
Causes of Edema
Edema has many causes, some much more serious than others. It can result from standing or walking in excessive heat; sitting for prolonged periods; eating too much salt; getting sunburned; or being premenstrual or pregnant. More serious causes of edema include the following:
- Certain medications
- Venous insufficiency
- Congestive heart failure
- Liver cirrhosis
- Kidney disease
- Chronic bronchitis or emphysema
- Infection, injury or allergic reaction
A lack of protein in the diet can also cause edema.
Symptoms of Edema
Edema is not difficult to diagnose because most of its symptoms are apparent upon examination. Symptoms include the following:
- Puffiness under the skin
- Skin that appears taut or shiny
- Increased size of the affected area
- Abdominal swelling
- Loss of elasticity in the skin
- Bloating, tightness or pain at the affected site
- Decrease in urine production
Treatment of Edema
Treatment for edema focuses on reducing the buildup of fluid. The simplest methods of reducing fluid are restricting salt and water intake. When edema is present in the legs, elevating them as frequently as possible also is helpful.
If further treatment is required, diuretics to promote urine production may be prescribed. When a patient has edema with hypertension, medications to lower blood pressure also may be prescribed. When edema is caused by disease in the lungs, heart, kidneys or liver, the underlying conditions must be addressed.