| The onychophagist habit of biting nails is psychodynamic, and suggests an interpretative hypothesis of onychophagia itself and the frequent sensation of trouble and refusal. |
| Onychophagist behaviour is a widespread but largely unstudied phenomenon, in which one of the interpretations characterises onychophagia as a non-pathological behavioural symptom. |
| For example, severe onychophagia was evident in six cases. |
