Mania

"Who is that man?"
she asked pointing in the direction of a tall, deranged looking man.

"that's Harry Styles, I hear he has a Mania"

♡

ma·ni·a

noun: mania
mental illness marked by periods of great excitement, euphoria, delusions, and overactivity.

synonyms: madness, derangement, dementia, insanity, lunacy, psychosis, mental illness; More
delirium, frenzy, hysteria, raving, wildness
"fits of mania"

an excessive enthusiasm or desire; an obsession.
plural noun: manias

"he had a mania for Younger Girls"

synonyms: obsession, compulsion, fixation, fetish