What should you know about one of my ankles is swollen?

A twist, strain, bruise or fracture may cause swelling with pain and difficulty bearing weight. Warmth, redness and tenderness can indicate inflammation or infection. A clot in a deep vein can cause one-sided swelling, aching or tightness, especially when it begins suddenly. Varicose Veins can contribute to pooling and heaviness. Conditions such as Heart Failure or Chronic Kidney Disease more often cause swelling in both legs, but a new one-sided change still needs its own assessment. Obesity can increase strain on joints and veins without identifying the cause by itself.

If the swelling followed a minor injury, rest the ankle, raise it when comfortable and use a wrapped cold pack for short periods. Avoid tight footwear and do not massage a suddenly swollen, warm or painful leg. Note when it started, whether the calf is affected, and any redness, fever, chest symptoms or breathlessness. Arrange medical advice promptly for unexplained one-sided swelling, even if the discomfort is mild. A clinician may examine the ankle and leg and decide whether imaging or other tests are needed.

Seek urgent help if ankle or leg swelling comes with chest pain, sudden breathlessness, coughing blood, faintness, or a fast heartbeat. Get same-day assessment for sudden swelling, significant pain, warmth, redness, fever, blue or pale skin, numbness, or inability to walk. After an injury, urgent review is also appropriate if the ankle looks deformed or pain is severe.

Could this be an injury, infection or a vein problem? Do I need an ultrasound or an X-ray? Should I change activity, footwear or any medicine while the cause is being assessed?