Narcissistic personality disorder is the clinical condition that most resembles and is most often associated with this definition and usage of the term, though the two differ vastly according to the individual's responses to others.
He described egoism as a lack of amiability while maintaining the ability to look after oneself, and egomania as a condition where one does not see things as they are, does not understand the world, and cannot take up a right attitude towards it.
[6] Over a century later, the term egomania re-appeared with a positive gloss to mark the post-modern quest for success and celebrity.
These individuals turn to alcohol or drugs as a coping mechanism in place of alternate methods of dealing with negative feelings, such as sadness and anxiety.
[10] The danger with the egomaniac is always that 'underneath the apparent over-confidence and bravado lies a fragile personality', driven by "grandiose fantasies of boundless success or power or perfect love"[11] which cannot be fulfilled.