Nail biting, also known as onychophagy or onychophagia (or even erroneously onyhophagia), . of 3, about 30 percent of children between 7 and 10 years of age and 45 percent of teenagers engage in nail biting. Finally, prevalence decreases in adults.
Nail biting can be a temporary, relatively nondestructive behavior that is merely a the permission and cooperation of the child or adult who is biting their nails.
In an attempt to determine the function of nail biting, a recent study found that, in young adults, nail biting occurred under conditions of working.
My first dip into the literature shows up the medical name for excessive nail biting: 'onychophagia'. Psychiatrists classify it as an impulse control.
It goes beyond just nail biting or occasionally chewing on a finger. It's not a habit or a tic, but rather a disorder. People with this condition gnaw.