Paranoid schizophrenia, or schizophrenia with paranoia as doctors now call it, is the most common example of this mental illness.
Schizophrenia is a kind of psychosis; your mind doesn't agree with reality. It affects how you think and behave. This can show up in different ways and at different times, even in the same person. The illness usually starts in late adolescence or young adulthood.
People with paranoid delusions are unreasonably suspicious of others. This can make it hard for them to hold...
Symptoms in teens can come on gradually over 9 months or more. They can sometimes imitate those of other problems such as anxiety or depression. Especially at first, symptoms may look like the stuff of typical teen years: bad grades, changing friends, trouble sleeping, or irritability.
But there are some early warning signs in teens that show up as changes in thinking, emotions, and behavior.
Changes in Thinking
Lack of concentration or ability to follow a train of thought
Seeing or hearing things that aren't real (hallucinations)