Can psychosis start out like paranoid personality disorder?

Maybe. They are different things. Psychosis refers to failures in reality testing (like delusions or hallucinations). It is possible that someone with a paranoid psychosis might be misdiagnosed with paranoid personality in the early stages of the illness, before psychotic symptoms become evident.
Sometimes. There are different forms of psychosis. Some people may exhibit symptoms of paranoia. Paranoid personality disorder & paranoid psychoses can look very similiar.

Related Questions

I feel like my step dad suffers of paranoid personality disorder. What are common symptoms?

Paranoid Personality. This personality typically misinterprets people's intentions and consistently sees others as not trustworthy.Best. Read more...

What are the signs and symptoms of OCD and paranoid personality disorder?

OCD/Paranoid. Ocd is an anxiety disorder characterized by unreasonable thoughts and fears (obsessions) that lead to repetitive behaviors (compulsions). Paranoid personality disorder involves a chronic, pervasive pattern of behaviors including distrust and suspicion, belief they are being deceived or exploited by others, emotionally guarded, angry, looking for hidden meanings or slights in conversations. Read more...

How do you tell the difference between paranoid personality disorder or just my generalized anxiety disorder?

Cause of fear. The main difference between paranoid personality disorder and generalized anxiety disorder is in what causes the anxiety. In paranoid personality the main issue is a distrust and fear of people with worry that others are malevolent or want to harm one. In generalized anxiety, the fear is about many different issues such as the future, possible accidents, illness, etc. Read more...
True paranoia. Is very different from gad. Why not ask your psychiatrist to explain the difference? Read more...