Daily Mail: 5-second finger test may detect lung cancer in some people

A simple finger test could help detect lung cancer, experts say, reports The Daily Mail.

Dubbed the “Schamroth window test” or “diamond test,” the five-second trick lokos for clubbed fingernails, which is a telltale sign of the disease.

Simply press your thumbnails or index fingernails together and see if there is a diamond-shaped gap between them. 

If there's no window, it could be a sign of fluid buildup around the lungs, a telltale sign of lung cancer.

Finger clubbing happens when soft tissue at the ends of the fingers swell and make the nails change shape.  

The exact mechanisms are unclear, though experts believe that it could be due to an overproduction of vascular endothelial growth factor (VEGF), a protein that tells blood vessels to grow.

This leads to increased blood flow to areas like the fingers, as well as fluid buildup throughout the body called edema and inflammation. 

Finger clubbing has also been seen in conditions like celiac disease, ulcerative colitis, and thyroid issues. 

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