When it comes to our health, we’re often told to watch out for the obvious warning signs: a persistent cough, unexplained weight loss, or breathlessness.
But what if your body was trying to tell you something important in a much subtler way—right at your fingertips?
Recent medical advice is shining a spotlight on a little-known symptom that could be an early indicator of lung cancer, a disease that remains one of Australia’s biggest cancer killers, especially among those over 50.
This symptom is called ‘finger clubbing’, and while it may sound innocuous, it’s a change you shouldn’t ignore.
Finger clubbing refers to swelling and changes in the shape of your fingertips and nails. It’s not just a cosmetic issue—this physical change can be a red flag for underlying health problems, most notably lung cancer.
The process usually starts with the base of the nail becoming soft and spongy, followed by the skin around the nail turning red and shiny. Over time, the angle between the nail and the cuticle increases, causing the nail to curve more than usual. Eventually, the entire fingertip may appear swollen and bulbous.
The exact cause of finger clubbing isn’t fully understood, but it’s believed to be linked to substances released by certain lung tumours. These substances can cause inflammation and changes in the small bones and tissues of the fingers. In some cases, harmful chemicals produced by the body in response to cancer can also play a role.
While finger clubbing is most commonly associated with lung cancer—accounting for up to 90% of cases according to some studies—it can also be seen in other conditions, such as heart disease, inflammatory bowel disease, and certain infections. However, if you notice this change and have no known underlying health issues, it’s important to get it checked out promptly.
Brian Gemmell, a fitness instructor from Scotland, knows firsthand how crucial it is to pay attention to this subtle sign. Brian’s only symptom was finger clubbing—he had no cough, no breathlessness, and felt otherwise healthy.
‘All your fingers swell up and when you put your fingers together you can’t see a diamond,’ he explained. His GP immediately recognised the significance and sent him for a chest X-ray, leading to a diagnosis of stage three lung cancer. Brian’s story is a powerful reminder that sometimes, the smallest changes can have the biggest implications.
There’s a simple at-home screening tool you can use called the Schamroth window test. Here’s how:
1. Place the nails of your index fingers from each hand against each other, nail to nail.
2. Look for a small, diamond-shaped window of light between the nail beds.
3. If you can’t see this window, and your nails seem to curve around each other, this could be a sign of finger clubbing.
If you notice this, especially if it’s new or getting worse, it’s time to see your GP.
While finger clubbing is a lesser-known sign, it’s important to be aware of the more common symptoms of lung cancer. Recognising these signs early can be crucial for timely diagnosis and treatment.
These include a persistent cough that doesn’t go away after three weeks, repeated chest infections, coughing up blood, and pain while breathing or coughing.
Other symptoms to watch for are persistent breathlessness or fatigue, unexplained weight loss, wheezing or noticeable changes in your voice, swelling of the face or neck, and difficulty or pain when swallowing.
Remember, not everyone with lung cancer will have all these symptoms, and not everyone with finger clubbing will have lung cancer. But if you notice any of these signs, especially in combination, don’t delay—book an appointment with your GP.
Lung cancer is often called a ‘silent killer’ because symptoms can be vague or appear late. In Australia, it remains the leading cause of cancer death, with the risk increasing as we age. While smoking is the biggest risk factor, it’s important to note that lung cancer can and does occur in non-smokers, and rates are rising among women and younger people.
Early detection is key. When caught early, lung cancer is much more treatable, and survival rates improve dramatically. That’s why it’s so important to pay attention to your body—even to changes that seem minor or unrelated.
When it comes to your health, it’s always better to be safe than sorry. Your fingertips might just be trying to tell you something important—so don’t ignore them!
Have you ever noticed finger clubbing or other unusual changes in your nails? Did it lead to a diagnosis or prompt you to seek medical advice? Share your experiences in the comments below—your story could help others spot the signs early.
Disclaimer: The information in this article is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Everyone’s health is unique, so if you have any concerns or questions about your health, it’s always best to consult with a qualified healthcare professional. We encourage you to seek expert guidance before making any medical decisions.
Also read: Beyond smoking: Study finds diet may play a role in lung cancer
