Swollen legs and heart failure: what to know

Heart failure does not mean that the heart has stopped. It means the heart is not moving blood as effectively as the body needs. Pressure can build in the veins, allowing fluid to move into the ankles, feet and lower legs. The skin may feel tight, shoes may become uncomfortable, and swelling may be more noticeable after standing. Both legs are often affected, although other causes can produce similar changes.

Breathlessness when lying down, unusual tiredness, a persistent cough or a faster heartbeat can occur alongside heart failure. These symptoms do not identify the cause by themselves, so an assessment is needed.

Arrange a clinical review if swelling is new, worsening, or returning after treatment. The clinician may check your heart and lungs, blood pressure, medicines, weight pattern and the skin of your legs. They may also consider kidney, liver, vein and medicine-related causes.

Take prescribed medicines as directed and do not change a water tablet or reduce fluids without advice. Keep a simple record of swelling, breathing, activity and any recent medicine changes. Resting with the legs supported may ease discomfort, but it does not replace assessment. A chronic disease review can help coordinate ongoing care.

Seek urgent medical help for sudden or severe breathlessness, chest pressure, fainting, confusion, blue or grey lips, or rapidly increasing swelling. Contact a clinician promptly if you are becoming breathless with less activity, cannot lie flat comfortably, develop a new cough at night, or notice a clear change from your usual pattern.

Ask what may be causing the swelling, whether your current medicines can contribute, how to monitor changes at home, and which symptoms should prompt same-day help. You can also ask whether a heart-failure review or checks for kidney and vein problems are appropriate.