Nail-biting is a common habit for many, but experts are sounding the alarm about the serious health risks associated with it. From bacterial infections to dental damage and skin issues, this seemingly harmless behavior could lead to significant, long-term consequences.The health risks of nail-bitingAccording to dermatologist Dr. Adam Friedman, who has conducted numerous studies on the dangers of nail-biting, the habit is far from innocent. Nail-biting introduces bacteria from the hands, which can lead to infections such as paronychia, Dr. Friedman warned. Paronychia is a painful infection that causes swelling around the nail, and in severe cases, it can spread throughout the body, requiring antibiotics and emergency surgery.Beyond infections, nail-biting can cause irreversible damage to the nail matrix—the tissue responsible for nail growth. Dr. Friedman explained, “Over time, this can lead to permanent nail deformities and difficulty growing nails back to their normal shape.” The act of constantly biting nails can also create a vicious cycle of anxiety, leading to increased psychological distress.The psychological and physical impactNail-biting is often linked to stress and anxiety, with many people using it as a coping mechanism. This can contribute to further emotional strain, creating a harmful loop that exacerbates both psychological and physical health problems.A study published by the National Institutes of Health found that nail-biting introduces bacteria into the mouth, raising the risk of oral and facial infections. The practice can also lead to herpetic whitlow, a viral infection that causes painful sores.Dental damage and moreIn addition to skin and infection issues, nail-biting can also have severe consequences for oral health. The British Dental Association points out that biting nails can lead to cracked, misaligned teeth and worn-down enamel.Real-life consequencesThe dangers of nail-biting were brought into sharp focus when Steven MacDonald, a 48-year-old father from Coatbridge, Scotland, suffered a life-threatening infection after biting his finger too hard. His finger became infected with pus, and the bacteria spread to his bloodstream. He required emergency surgery after being treated with powerful antibiotics.
