Paranoia may be a symptom of a possible underlying severe mental disorder, such as schizophrenia or another psychotic disorder. On the other hand, paranoid behavior is sometimes within the realm of normal human behavior.
If there is no psychosis, but the paranoia interferes with the person's life, it might be best described as Paranoid Personality Disorder, which is diagnosed by the presence of at least four of the following symptoms:
*suspects, without sufficient basis, that others are exploiting, harming, or deceiving him or her
*is preoccupied with unjustified doubts about the loyalty or trustworthiness of friends or associates
*is reluctant to confide in others because of unwarranted fear that the information will be used maliciously against him or her
*reads hidden demeaning or threatening meanings into benign remarks or events
*persistently bears grudges, i.e., is unforgiving of insults, injuries, or slights
*perceives attacks on his or her character or reputation that are not apparent to others and is quick to react angrily or to counterattack
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