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15. Clubbed Nails

Clubbed nails are caused by increased blood flow to the fingertips, which results in the tissue beneath the nails becoming rounded. The nail then grows over the rounded tip. Often, it runs in families and is harmless. If it develops suddenly, it could be a symptom of inflammatory bowel disease, lung or heart disease, liver cirrhosis, or cancer.

Fingers with signs of nail biting. Petra Richli/ Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.