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Understanding Unexplained Foot Swelling
March 31st, 2026

What Does It Mean When Your Feet Swell for No Reason?

Sudden foot swelling without obvious cause typically indicates fluid retention or circulation issues. Common underlying causes include heart failure, kidney disease, liver problems, or venous insufficiency. Even seemingly minor conditions like prolonged sitting, high sodium intake, or certain medications can trigger swelling. About 6% of adults experience chronic edema, with women being twice as likely as men to develop it. The swelling often starts gradually and may be accompanied by weight gain, shortness of breath, or fatigue. If swelling persists for more than a few days, appears suddenly, or occurs with chest pain or breathing difficulties, seek immediate medical evaluation to rule out serious conditions.

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