Leg swelling causes below the knee

Swelling in both legs that is worse after standing can occur when veins return blood less efficiently; varicose veins are one possible contributor. A recent knock, sprain, skin infection, or joint problem may affect one side. Some medicines can also cause ankle or lower-leg swelling. Conditions such as Heart Failure or Chronic Kidney Disease can alter how the body handles salt and fluid. Obesity can add pressure to the veins. The location alone cannot identify the cause, so note whether the skin is warm, painful, red, or leaving a dent after pressure.

Record when the swelling began, whether one or both legs are affected, and what makes it better or worse. Gentle walking and changing position regularly may support circulation. When resting, raise the lower legs comfortably, avoid tight socks, and protect swollen skin from cracks. Do not stop a prescribed medicine or start water tablets without medical advice. Arrange a clinician review if swelling persists, returns, or comes with breathlessness, reduced urine, or a new medical problem.

Seek urgent medical help for sudden swelling in one leg with pain, warmth, redness, or tenderness, particularly after prolonged immobility or travel. Emergency help is needed for swelling with chest pain, severe breathlessness, fainting, or coughing blood. Contact a clinician promptly for rapidly worsening swelling, fever, an open wound, or swelling that does not settle.

Ask what cause best fits the distribution and timing, whether your medicines or recent injury could contribute, and which examination or tests are appropriate. Ask how to monitor changes at home and which symptoms should prompt same-day care.