NHS warning leg symptom that gets worse through the day can signal heart failure

The NHS is warning people to be vigilant for a potentially fatal symptom that could indicate heart failure. The health body has highlighted leg swelling, known as oedema, as a key sign of the condition.

This can also affect the feet and ankles, making walking uncomfortable. The symptom may improve in the morning but "get worse later in the day", according to the NHS.

Heart failure, which occurs when the heart cannot pump blood around the body effectively, usually develops because the heart has become too weak or stiff. The NHS states: "Heart failure is a long-term condition that tends to get gradually worse over time. It cannot usually be cured, but the symptoms can often be controlled for many years."

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Medical News Today experts explain that heart failure increases blood pressure in the vessels due to the heart's reduced pumping efficiency.

"This elevation in pressure forces fluid out of the blood vessels and into the surrounding tissues, resulting in swelling, or oedema," they said. Oedema can also be caused by other factors and may present alongside other signs of heart failure, reports the Mirror.

Some individuals with heart failure may also experience depression and anxiety. The NHS advises: "See your GP if you experience persistent or gradually worsening symptoms of heart failure."

"Call 999 for an ambulance or go to your nearest accident and emergency (A&E) department as soon as possible if you have sudden or very severe symptoms."