7/10 people have nails biting habit. According to the scientists nail biting is an Obsessive-Compulsive Disorder, but very few are aware that the real reason behind the nail bites is more psychological and it varies from person to person.
There are several things that only people who bite their nails will relate to. Hiding the hands in public or avoiding nail bleed, nail biters go through a lot. If you are also a big nail biter then you would surely relate these signs.