Narcissus (1597–99) by Caravaggio; the man in love with his own reflection.<unk>  is a self-centered personality style characterized as having an excessive interest in one's physical appearance and an excessive pre-occupation with one's own needs, often at the expense of others. It is human nature for people to be selfish and<unk>  exists on spectrum that ranges from normal to abnormal personality expression. There is a significant difference between normal, healthy levels of<unk>  and people who are difficult/self-absorbed, or people having a pathological mental illness like<unk> ic personality disorder.
Narcissism
Bruxism
Caffeine dependence
Overlap syndrome
Locomotive syndrome
Myelokathexis
Proteus-like syndrome
Purple glove syndrome