A simple finger test could determine early signs of lung cancer, it has been reported.
People are being urged to examine themselves in a bid to spot if anything's changed with their health.
The test can be done at home and could show if you have finger clubbing, the swelling and softening of fingers and nails.
It can be a sign of underlying health conditions, particularly ones that impact the lungs or heart, including cancer and mesothelioma.
According to Cancer Research UK, more than 35% of people with non-small cell lung cancer experience finger clubbing.
The charity says it can be found in some people with thyroid problems, or other conditions, like ulcerative colitis and Crohn's disease.
It can be checked by doing the Schamroth window test – or window gap test.
Press your thumbnails or index finger together and see if there is a small diamond-shaped window between them.
If you cannot see a window then it is possible you have finger clubbing and you should seek medical advice.
Finger clubbing generally takes years to develop, but can happen quicker in certain conditions like lung abscess.
Cancer Research said on its website: "Finger clubbing is unusual. If you have it and are worried, do speak to your doctor.
"They can examine you and find out about any other symptoms you might have.
"They should send you for a chest X-ray to check your heart and lungs.
"Clubbing is thought to be caused by fluid collecting in the soft tissues at the end of the fingers."
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The charity continued: "This is caused by more blood flowing to the area than usual.
"But we don't fully understand why this happens. It may be due to the tumour producing particular chemicals or hormones."
If you're worried it's best to contact your local GP for guidance.
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