Why does heart failure cause swollen ankles?

When the heart pumps less effectively, blood can back up in veins returning blood to the heart. The increased pressure encourages fluid to leave those vessels and collect under the skin. Gravity makes the ankles and lower legs common places to notice this, especially after sitting or standing for a long time. Swollen Ankles is a very common presentation of Heart Failure.

The skin may look puffy or feel tight, and a sock mark may remain after you remove it. Swelling can have other causes, including vein problems, kidney or liver conditions, injury, medicines, pregnancy and prolonged immobility, so its pattern matters.

Tell your clinician about new swelling or a clear increase from your usual baseline. Note whether it affects one ankle or both, whether it improves overnight, and whether it occurs with breathlessness, cough, belly swelling, reduced urine, or tiredness. Follow your personalised fluid, salt, activity and medicine plan; do not start, stop or increase a water tablet on your own.

When resting, raising your legs may feel more comfortable. Avoid tight socks or footwear that leave painful pressure marks, and keep skin clean and dry to reduce irritation.

Seek urgent medical help for sudden swelling in one leg with pain, warmth or redness, particularly if you also have chest pain or breathlessness. Get urgent care for rapidly increasing swelling with severe breathlessness, fainting, confusion, or pink frothy sputum. Contact your clinician promptly if swelling is worsening over days or limits shoes, walking or usual movement.

Is this swelling likely to be fluid retention, and do I need tests to check my heart, kidneys or veins? What changes in swelling should I track at home? Are my medicines and fluid plan still appropriate?