Health Correspondent – Edema is the abnormal accumulation of fluid in the body’s tissues, causing visible swelling.

It most commonly affects the feet, ankles and legs, but fluid can also accumulate in the hands, face, lungs or abdomen.
Although mild swelling can sometimes result from standing or sitting for long periods, persistent or widespread edema can be a sign of an underlying medical condition that requires attention.

What causes edema?
Under normal circumstances, fluid constantly moves between the bloodstream and surrounding tissues. The body maintains a balance that prevents excessive fluid from accumulating.

Edema develops when this balance is disrupted. This can happen when there is increased pressure inside blood vessels, reduced blood protein levels, problems with the lymphatic system, or when the kidneys retain too much salt and water.

Common causes include:
Heart failure
Kidney disease
Liver disease
Certain medications
Chronic venous insufficiency
Prolonged standing or sitting
Pregnancy
Severe nutritional deficiencies
Damage or blockage of the lymphatic system
Edema and congestive heart failure
One of the important causes of generalized edema is congestive heart failure.

When the heart cannot pump blood effectively, blood can begin to back up in the veins. The increased pressure forces fluid from the blood vessels into surrounding tissues.

This can result in swelling of the ankles and legs.
If heart failure becomes more advanced, fluid can also accumulate in the abdomen. This condition is known as ascites.
In some patients, fluid can also accumulate in the lungs, producing pulmonary congestion. This may cause shortness of breath, coughing and difficulty breathing when lying down.

Therefore, a combination of swollen legs, an increasingly enlarged abdomen and breathing difficulties can be an important warning sign of significant fluid retention and should be medically assessed.

What does edema look and feel like?
Edema can cause the affected area to appear visibly swollen or stretched. The skin may look shiny and feel tight.
In many cases, pressing a finger firmly into the swollen skin for several seconds leaves a temporary indentation.

This is called pitting edema.
However, not all edema is pitting edema.
The swelling may affect both legs or may occur predominantly on one side, depending on its cause.

Edema of the abdomen
When fluid accumulates inside the abdominal cavity, the abdomen may gradually become larger and feel uncomfortable or heavy.

Abdominal fluid can occur in advanced heart failure, but it can also result from liver disease, kidney disease, certain cancers and other conditions.
An enlarged abdomen therefore should not automatically be attributed to heart failure without medical evaluation.

Symptoms that may accompany edema
Depending on the underlying cause, a person with edema may experience:

Swollen ankles and legs
Rapid increase in body weight

Tight or shiny skin
Reduced mobility
Abdominal swelling
Reduced appetite
Fatigue or weakness
Shortness of breath
Difficulty breathing when lying flat
Increased urination after taking diuretics
Rapid weight gain can be particularly important because it may indicate that the body is retaining fluid.

When edema requires urgent attention
Edema accompanied by severe shortness of breath, chest pain, fainting, confusion, blue or grey lips, or sudden deterioration requires urgent medical attention.

Sudden swelling of one leg, particularly when associated with pain, warmth or redness, can also require urgent assessment because a blood clot may be present.
How edema is treated
Treatment depends entirely on the underlying cause.

When edema is caused by heart failure, doctors may prescribe diuretics, commonly called water tablets, to help the kidneys remove excess sodium and water.

Other heart-failure medications may be used to improve the heart’s function and reduce the risk of further deterioration.

If kidney, liver or venous disease is responsible, treatment must focus on that condition.
Doctors may also recommend measures such as appropriate physical activity, leg elevation, compression therapy in selected patients, and individualized dietary or fluid management.

It is important not to start or increase diuretics or severely restrict fluids without medical advice, because excessive fluid removal can cause dehydration, low blood pressure or kidney problems.

Edema is a symptom, not a disease
Edema itself is not a diagnosis. It is a sign that something is causing abnormal fluid accumulation.

For an older person who develops persistent swelling of the legs together with an increasingly enlarged abdomen, heart failure is one possible explanation, particularly if there are also symptoms such as breathlessness, fatigue or difficulty lying flat.

However, kidney disease, liver disease and other conditions can produce similar symptoms.
A medical assessment can help determine the actual cause through physical examination, blood tests, an ECG, chest imaging and, where appropriate, an echocardiogram.

Conclusion
Edema may appear to be a simple swelling of the feet or legs, but persistent or widespread swelling can sometimes be a warning sign of serious disease.

Swollen legs plus abdominal enlargement should not be ignored, particularly in an older person or someone with known heart, kidney or liver disease. Identifying the underlying cause early can allow appropriate treatment and, in some cases, prevent complications.