Paranoia is a mental health condition. You may have nonstop suspicion, fear, anger, and even delusions. Cognitive behavioral therapy, counseling, or anti-psychotic drugs may help. Find out how ... Paranoia is when you feel like you're being deliberately harmed in some way, but there's no evidence, or very little evidence, that you are. Learn about the possible causes of paranoia , how it can affect your life, and how it relates to mental health problems such as psychosis and personality disorders. PARANOIA definition: 1. an extreme and unreasonable feeling that other people do not like you or are going to harm or…. Learn more. Paranoia is a thought process influenced by anxiety, suspicion, or fear, often leading to delusions and irrationality. Learn about the signs, causes, and subtypes of paranoia , as well as how it relates to psychosis, discrimination, and drug use.