What Swollen Legs Might Reveal About Your Health—and Why It Matters
Swollen legs or ankles are often caused by something relatively simple, such as standing for a long time, hot weather, excess salt, or certain medications. But persistent or unexplained swelling can sometimes point to an underlying medical problem.
Common causes
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Chronic venous insufficiency: Leg veins have difficulty returning blood to the heart, often causing swelling that gets worse later in the day.
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Heart problems: Some forms of heart failure can cause swelling in both legs, often along with breathlessness or unusual fatigue.
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Kidney disease: Reduced 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 and swelling.
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Medications: Some blood-pressure medicines, steroids, hormones, and other drugs can cause edema.
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Lymphedema: Problems with the lymphatic system can produce persistent swelling, sometimes affecting one or both legs.
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Injury or infection: Localized swelling may occur around an injured or infected area.
When the pattern matters
Both legs swollen gradually: More commonly associated with fluid retention, medications, or problems affecting veins or other organs.
One leg suddenly swollen, painful, warm, or red: This needs prompt medical assessment because a deep-vein thrombosis (DVT) is one possible cause.
🚨 Get emergency help for
Leg swelling accompanied by sudden shortness of breath, chest pain, coughing up blood, fainting, or severe weakness. These can be symptoms of a pulmonary embolism or another emergency.
What you can do
If your swelling is mild and you otherwise feel well, regular walking, avoiding prolonged sitting or standing, elevating your legs when resting, and moderating excessive salt intake may help. However, persistent or recurrent swelling should be evaluated rather than treated only at home.
The key is to look at the pattern, duration, and accompanying symptoms. Swollen legs don’t point to one specific disease by themselves.
