noun
Psychiatric term for paranoia; often used in clinical or formal contexts. The loanword パラノイア is also common.
See also: パラノイア
偏執病の症状として、強い被害妄想が現れることがある。
As a symptom of paranoia, strong persecutory delusions may appear.
彼は偏執病と診断された。
He was diagnosed with paranoia.
Refers to delusional disorder; 偏執病 is an older term for paranoia, sometimes used interchangeably but less common in modern diagnostics.
Compound of 偏執 (へんしゅう, 'obsession, bigotry') and 病 (びょう, 'illness'). The exact historical derivation is uncertain; the term is a Sino-Japanese medical coinage.