A quick look at your fingertips could reveal more than you might expect. Emma Norton, an oncology nurse advisor based in the United Kingdom, is raising awareness of a simple self-check called the Schamroth window test, which can detect a phenomenon known as finger clubbing — a physical sign associated with lung cancer and several other serious health conditions.
In brief
- —Finger clubbing may signal lung cancer or heart disease
- —The Schamroth window test takes only a few seconds at home
- —Other nail signs can also point to thyroid, bone or immune conditions
What finger clubbing looks like and how it develops
Finger clubbing — also called digital clubbing — occurs when the ends of the fingers swell progressively. It can present as widened fingertips, a downward, almost beak-like curve of the nails, or visibly enlarged tips caused by fluid buildup. The condition typically develops in stages rather than appearing suddenly.
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