The hallmarks of this personality disorder are distrust and suspicion. Individuals who exhibit constitutional paranoia do not normally confide in other people and frequently misread others, redefining innocuous statements and behavior as malevolent.
The paranoid personality-disordered person is suspicious of others—this individual thinks that others are out to threaten, betray, exploit, or harm. This disorder presents most often in young adulthood. People with paranoid personality disorder are not normally grounded in reality, nor do they admit that they have negative feelings about other people. They distrust people so much that they will not discuss how they feel, and harbor suspicions for lengthy periods of time.