Swollen ankles

Swollen ankles may reflect fluid collecting in the tissues, also called oedema. Prolonged sitting, injury, medicines and heart, kidney or circulation problems are among the possible causes. Whether swelling affects one or both legs, how quickly it developed and whether there is pain or breathlessness helps determine urgency.

Why does one-sided swelling matter?

New swelling in one leg can have a different assessment from gradual swelling in both ankles. A blood clot, infection or injury may need to be excluded. Tell the clinician about pain, warmth, redness, recent travel, surgery, pregnancy and reduced mobility.

For swelling in both legs, describe whether it changes during the day, whether shoes feel tighter and whether you also feel breathless or notice weight changes. Mention current medicines and existing heart, kidney or liver disease. Do not assume fluid retention simply means you should drink less.

For the Australian guidance behind this explanation, see Healthdirect Australia: Fluid retention - Healthdirect Australia.

What should I do before the appointment?

Avoid making large changes to fluid intake or taking someone else's treatment to remove fluid. A clinician needs to identify the cause first. Ask whether elevation or movement is appropriate for your situation, especially if the swelling is new or painful.

Examination may assess circulation, skin and heart or lung findings. Blood tests, urine tests or imaging may be needed. Telehealth can gather the history and review an established plan, but a new swollen leg often needs direct assessment. Keep a record of onset and associated symptoms rather than only sending a photograph.

When is it urgent?

Sudden one-sided swelling, a painful hot leg or swelling with breathlessness needs urgent assessment. Call 000 for chest pain, severe breathing difficulty, collapse or coughing blood. New swelling during pregnancy with headache, visual changes or significant illness also needs prompt maternity advice. Do not wait for a routine online consultation if symptoms are rapidly changing.

Where to go next

Read online doctor consultations to understand the relevant service. A doctor decides whether a consultation, examination, referral or another pathway is appropriate for your situation.