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A pervasive feeling of distrust of others.

Paranoia is an ever-present feeling of suspicion that others cannot be trusted. Such feelings are not based on fact or reality; insecurity and low self-esteem often exaggerate these emotions. Typically, paranoia is not seen in children, but in most cases it begins to develop in late adolescence and early adulthood. Most people experience feelings of paranoia, usually in response to a threatening situation or in connection with feelings of insecurity based on real circumstances. These feelings are related to the mild anxiety people experience at some points during their lives.

The fourth edition of Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) includes diagnostic criteria for the...