Ego syntonic is refers to personality traits that are perceived
as a natural part of oneself, that you may not want to change.
Ego syntonic is related with the self-concept. If the self
concept is good then the person will lead to the healthy life, but
if a person is not aware of his/her bad habits or behavior, or does
not perceive his/her behavior as wrong thing, then this kind of
wrong perception toward self, may lead to the ego syntonic
disorder.
This kind of disorder is difficult to treat. Eating disorder is
one of the syntonic disorders.