Nail biting, or onychophagia, carries significant health risks beyond appearance. This habit can injure gums, spread harmful ...

“Nail biting can cause small injuries around the nail, allowing bacteria, viruses and fungi to enter. This may lead to an infection called paronychia, which causes inflammation of the nail fold,” ...

The nail-biting action for fans when a Dodgers pitcher stares down a Blue Jays batter is as real to the body as any other ...