Medical experts in the UK are highlighting a remarkably simple self-check that could point to an early symptom of lung cancer. The test, which involves examining the fingernails, may help identify a condition known as finger clubbing, which is associated with a significant proportion of lung cancer cases.
The 'Diamond Gap' Test Explained
To perform the check, place the fingernails of your two index fingers together, back to back. The key question, as advised by the Roy Castle Lung Cancer Foundation, is whether you can see a small, diamond-shaped gap between the nails where they meet at the cuticle.
If this diamond-shaped window is absent, it could suggest finger clubbing. This symptom is present in roughly 35% of people with non-small cell lung cancer and about 4% of those with small cell lung cancer.
It is crucial to note that not having the gap does not automatically mean you have cancer. However, it can be a significant indicator that warrants further medical investigation. The charity strongly advises: "If you think your nails are clubbed, speak to your doctor."
Understanding Finger Clubbing and Other Symptoms
Finger clubbing involves gradual changes to the shape of the fingers and nails. It typically develops slowly, often over years, starting at the nail base. The nails may soften at the bed, the skin around the nail may become reddened, and the nails may begin to curve downwards more dramatically than usual.
Cancer Research UK explains that this condition, also called digital clubbing, is sometimes linked to heart or lung problems. While it is a potential warning sign, lung cancer presents with several other more common symptoms that people should be aware of.
These include:
- A persistent cough that does not go away.
- Breathlessness during everyday activities.
- Coughing up blood.
- Unexplained tiredness and weight loss.
- Pain or discomfort when breathing or coughing.
The Importance of Early Detection
This advice is particularly vital given the prevalence of lung cancer in the UK. NHS statistics show that over 43,000 people are diagnosed with lung cancer each year across the nation.
The disease predominantly affects older adults, with more than four in ten diagnoses given to people aged 75 and over. It is rare in those under 40. While non-smokers can develop lung cancer, smoking remains the most common cause, responsible for more than 70 out of every 100 cases.
The NHS guidance is clear: anyone experiencing these symptoms, including potential signs of finger clubbing, should consult their GP. Early detection can be life-saving, making awareness of all potential symptoms, even those appearing on the hands, critically important.
