Heart, kidney, or liver problems can also contribute to generalized fluid retention.

Again, the appearance of the swelling cannot determine which condition is responsible.

What About Kidney Problems?

Your kidneys play an important role in controlling fluid and electrolyte balance.

When kidney function becomes impaired, the body may retain additional salt and water.

This can contribute to swelling around the ankles, feet, legs, hands, or sometimes around the eyes.

Other symptoms may include changes in urination, fatigue, nausea, itching, or changes in blood pressure.

However, kidney disease can develop gradually and sometimes produces few noticeable symptoms in its early stages.

Routine medical testing can therefore be important for people at increased risk.

Heart Conditions Can Also Cause Edema

When the heart cannot circulate blood efficiently, pressure can build up in the venous system.

Fluid may then move into surrounding tissues, causing swelling, particularly in the lower legs and ankles.

Swelling associated with heart problems may occur alongside:

Shortness of breath

Reduced exercise tolerance

Fatigue

Difficulty breathing when lying flat

Rapid weight gain from fluid retention

If swelling appears together with significant breathing difficulty or chest symptoms, prompt medical evaluation is important.

Cancer Can Sometimes Affect the Lymphatic System

The lymphatic system is responsible for transporting fluid from tissues back into circulation.

When lymphatic drainage becomes impaired, fluid can accumulate, producing lymphedema.

Cancer itself may sometimes contribute to lymphatic obstruction, and certain cancer treatments—particularly surgery involving lymph nodes or radiation—can damage lymphatic pathways.

Lymphedema can cause persistent swelling and a feeling of heaviness or tightness in the affected limb.