Paranoid personality disorder is a debilitating mental illness characterized by persistent mistrust, suspicion, and irrational beliefs. Synonyms for this condition include delusional thinking, obsessive distrust, and persecutory delusions. People with this disorder may exhibit compulsive behaviors, such as checking locks many times a day or refusing to leave their homes. They may also be hostile towards others, prone to anger, and quick to blame others for perceived slights or offenses. Other synonyms for paranoid personality disorder may include paranoid schizophrenia, persecutory delusional disorder, or simply paranoia. Regardless of the term used, treatment for this disorder often involves therapy and medication aimed at reducing anxiety, improving self-esteem, and reducing symptoms of paranoia.