Clubbed Fingers and Nails: Causes and What They Look Like
https://www.verywellhealth.com/clubbing-of-fingers-914776
WebMay 17, 2023 · Summary. Nail clubbing causes the fingers (or toes) to swell and turn red while the nails turn downward. It could be just an inherited family trait or it could be a sign of a serious medical condition involving the heart, liver, lungs, intestine, or stomach. In fact, 90% of all clubbing cases are caused by lung cancer.
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