YOUR fingernails aren't just a place to paint nail varnish on - they could provide a window into your health.

A subtle but common sign could suggest you have a dangerous form of heart disease, which may cause no other noticeable symptoms but could leave you at risk of sudden death if left untreated.

Press down on your nail: can you see a a red, pulsing movement in the nail bed?

This is known as the Quincke's sign - and it could be caused by aortic regurgitation.

Joanne Whitmore , lead nurse at the British Heart Foundation (BHF), explained to Sun Health: "Quincke's sign in the nail bed can be a sign of severe aortic valve insufficiency, as well as other heart conditions."

Normally, your blood flows around your heart and the rest of your body in one direction . The BHF compares it

See Full Page