Heart failure and leg swelling: what to know

When the heart's pumping or filling is impaired, pressure can rise in the veins. The body may also retain salt and water, allowing fluid to move into tissues around the ankles and lower legs. Heart failure may present with swollen ankles alongside breathlessness, fatigue, cough or reduced exercise tolerance. One swollen leg, especially if it is painful, warm or suddenly enlarged, can point to another urgent problem rather than heart failure.

Arrange a review for new or increasing swelling, particularly when it occurs with breathlessness or a noticeable drop in stamina. Record whether one or both legs are affected, when the swelling appears, and whether it improves after resting with the legs raised. Take your medicine list to the appointment. Do not start water tablets, change prescribed doses or sharply restrict fluids without clinical advice. A chronic disease review can be useful for checking symptoms, medicines and monitoring plans.

Seek emergency care for sudden breathlessness, chest pain, fainting, confusion, blue lips or coughing up pink frothy fluid. Get urgent assessment for sudden one-sided leg swelling with pain, warmth or redness, or for swelling that rapidly worsens with breathlessness at rest. These signs can represent problems needing prompt treatment.

Ask whether the pattern suggests fluid retention, a medicine effect, a vein problem or another cause. Discuss whether you should monitor symptoms at home, how to take prescribed treatment, and which change should prompt a same-day call. Ask when your heart function and medicines should be reviewed.