4. Paranoid Personality Disorder (PPD)

Paranoid personality disorder or PPD is an eccentric personality disorder. The main characteristics are paranoia and extreme distrust of others without any reason to be suspicious. PDP affects men more than women and often begins in childhood. The cause is unknown, but it is believed to be a combination of psychological and biological factors. Childhood trauma may play a role, and there appears to be a genetic connection to schizophrenia.

Paranoid Personality Disorder PPD Tero Vesalainen / Getty Images
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