'See a doctor immediately' if your fingernails do this when you press them

People have been warned to seek "immediate" professional help if they notice this particular sign when applying pressure to their fingernails. According to foot and ankle surgeon, Doctor Dana Brems, "pulsating" shades of pink and white beneath the nail could indicate a severe cardiac condition.

This symptom is recognised in the medical field as Quincke's sign and it suggests you could have a leaky heart. Without prompt treatment this can lead to heart failure and even cardiac death, she warned.

In a video posted to social media platform TikTok, Dr Brems provided further details about Quincke's sign whilst demonstrating an example of what this might appear like. "If you see this in your nails, you need to see a doctor immediately," she stated.

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"This is Quincke's sign. It can be seen when you press gently on your fingernail or toenail and notice these pulsating capillaries in the nail bed. It's a sign of aortic insufficiency.

"In this condition the aortic valve of the heart doesn't close properly. So when the blood is supposed to be pushed to the rest of the body,it's actually leaky and a lot of the blood comes back into the heart."

She cautioned: "This can lead to heart failure or even setting cardiac death. This is an example of how a subtle finding can mean a big problem." A case study, published in the British Medical Journal in 2021, examined an instance of Quincke's sign in a 74-year-old patient.

The man also exhibited other symptoms such as breathlessness, weight gain, oedema (swelling), and increased jugular venous pressure. As a result, he was diagnosed with and treated for congestive heart failure.

The study report said: "Quincke's pulse is characterised by alternating flushing and blanching of the nail bed in concert with the cardiac cycle, and frequently occurs along with wide pulse pressure. It is most commonly associated with severe aortic valve insufficiency; however, it can also be seen in patients with coarctation of the aorta as well as in patients with high-output physiology.

"The presence of Quincke's pulse in a patient presenting with heart failure should raise suspicion for high-output heart failure."

According to the NHS, other warning signs of heart failure include:

• Breathlessness
• Swollen ankles and legs
• Feeling lightheaded and fainting
• A persistent cough, which may be worse at night
• Wheezing
• A bloated tummy
• Loss of appetite
• Weight gain or weight loss
• Confusion
• A fast heart rate
• A pounding, fluttering or irregular heartbeat (palpitations)

If you experience persistent or gradually worsening symptoms of heart failure, you should consult your GP. The NHS adds: "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."