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'''Paranoia''' is a mental condition characterized by irrational [[fear]]. It can be caused by [[psychosis]] or by certain [[drugs]].

'''Paranoid personality disorder''' is a mental condition characterized by irrational [[fear]]. It can be caused by [[psychosis]] or by certain [[drugs]].

Individuals with paranoid schizophrenia and persecutory delusional disorder experience what is known as persecutory delusions: an irrational, yet unshakable, belief that someone is plotting against them.  Paranoid beliefs are prevalent in many individuals and are often the cause  of disputes between individuals and society.   

Individuals with paranoid schizophrenia and persecutory delusional disorder experience what is known as persecutory delusions: an irrational, yet unshakable, belief that someone is plotting against them.  Paranoid beliefs are prevalent in many individuals and are often the cause  of disputes between individuals and society.