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3. Nail Clubbing
Image Source: wikimedia.org
This next symptom is very unique and easy to identify – we’re talking about nail clubbing, namely the bulbous appearance of both the tip of your fingers and your nails. The main cause for nail clubbing is reduced amounts of oxygen in the body, which can occur due to serious lung diseases including lung cancer. There are other serious diseases associated with nail clubbing, ranging from thyroid illnesses to liver conditions, so make sure to see a doctor immediately once you notice that your nails are becoming bulbous.