Nail-biting, or onychophagia, is one of several common body-focused repetitive behaviors. While it's a fairly common habit at various points in people's lives, especially in childhood and teenage years, and is often done to relieve boredom or stress, adults usually grow out of the habit. But those who compulsively bite their nails into adulthood can suffer embarrassment and anxiety about it, find it self-perpetuating and difficult to stop. While it is not dangerous it has a number of negative physical, psychological and emotional or behavioral consequences. One possible positive potential consequence of nail-biting exists: by seeking treatment, the nail-biter could discover relief from anxiety or an obsessive-compulsive disorder that might be causing the nail-biting behavior.