Nail biting, also known as onychophagy or onychophagia, is an oral compulsive habit of biting one's fingernails. It is sometimes described as a parafunctional activity, the common use of the mouth for an activity other than speaking, eating, or drinking. Nail biting is very common, especially amongst children.

Is biting your nails a mental disorder?

A: Doctors classify chronic nail biting as a type of obsessive-compulsive disorder since the person has difficulty stopping. People often want to stop and make multiple attempts to quit without success. People with onychophagia cannot stop the behavior on their own, so it's not effective to tell a loved one to stop.

What does it mean when someone is nail biting?

Sometimes, nail biting can be a sign of emotional or mental stress. It tends to show up in people who are nervous, anxious or feeling down. It's a way to cope with these feelings. You may also find yourself doing it when you're bored, hungry or feeling insecure.