Nail-biting Onychotillomania 2019-05-23T23:17:34Z Onychotillomania should not be confused with onychophagia, which refers to self-induced damage to nails caused by nail biting. Onychotillomania is characterized by the compulsive or irresistible urge in patients to pick at, pull off, or harmfully bite or chew their nails. Tactile sensory seeking