What Swollen Legs Might Reveal About Your Health
Swollen legs or ankles (edema) can have a simple cause, such as standing for a long time, but persistent swelling can sometimes indicate an underlying medical problem.
Common causes
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Standing or sitting for long periods — fluid can accumulate in the lower legs.
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Venous insufficiency or varicose veins — damaged leg veins can make it harder for blood to return to the heart.
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Certain medications — some blood-pressure medicines, steroids, and other drugs can cause edema.
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Heart problems — heart failure can cause swelling in both legs, often together with breathlessness or reduced exercise tolerance.
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Kidney disease — impaired kidney function can cause the body to retain salt and fluid.
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Liver disease — advanced liver disease can contribute to fluid accumulation.
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Lymphedema — problems with lymphatic drainage can produce persistent swelling.
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Injury or infection — usually affecting one particular area.
When swelling needs urgent attention
Sudden swelling in one leg, particularly with pain, warmth, or redness, can be a sign of a deep-vein thrombosis (DVT) and requires prompt medical assessment.
If leg swelling occurs with chest pain, sudden shortness of breath, coughing blood, fainting, or severe difficulty breathing, seek emergency medical care.
For persistent or unexplained swelling, a clinician can determine the cause rather than assuming it’s simply excess fluid. Treatment depends on the underlying problem; don’t start taking water pills (diuretics) without medical advice.
