The following is taken from Quora:
Is Donald Trump suffering from something?
Alexander Lee (梅治 新太)
Alexander Lee (梅治 新太), Vice President of Creative Outreach at Consiglio Devastations
Answered May 2
Originally Answered: What does Donald Trump suffer from?
Since I’m not a practicing psychiatrist, I don’t exactly have to follow the “Goldwater Rule”, which means I can pull out all the stops.
Narcissistic Personality Disorder— obvious from the fact that Donald Trump views himself as a “very stable genius” despite not being stable nor a genius, and claims that everyone loves him and knows he’s the best, even though it’s not true.
He’s also incapable of taking criticism, labelling all criticisms as “fake news”.
Trump takes every opportunity he can get to seek attention and approval from his followers.
Grandiose Delusions— goes hand-in-hand with NPD.
Belief perseverance (this is more of a symptom than an actual illness)— obvious from the fact that Trump refuses to change his beliefs despite being presented with overwhelming evidence of why his beliefs are false.
Antisocial Personality Disorder— obvious from the fact that Trump lies compulsively in order to manipulate and deceive, behaves compulsively, and disregards the lives of others.