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The exact cause of paranoia is unknown. Potential causal factors may be genetics, neurological abnormalities, changes in brain chemistry, and stress. Paranoia is also a possible side effect of drug use and abuse (for example, alcohol, marijuana, amphetamines, cocaine, PCP). Acute, or short term, paranoia may occur in some individuals overwhelmed by stress.
The Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV), the diagnostic standard for mental health professionals in the United States, lists the following symptoms for paranoid personality disorder:
- suspicious; unfounded suspicions; believes others are plotting against him/her
- preoccupied with unsupported doubts about friends or associates
- reluctant to confide in others due to a fear that information may be used against him/her
- reads negative meanings into innocuous remarks
- bears grudges
- perceives attacks on his/her reputation that are not clear to others, and is quick to counterattack
- maintains unfounded suspicions regarding the fidelity of a spouse or significant other
Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.";

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