Paranoia takes over your life. Going outside or to a big window makes it worse. That is why paranoid people isolate themselves to stay safe from what is out there threatening them, at least in their mind. Fear is constant and worry goes with them everywhere. It is quite common in the population, but when the paranoia takes over your life, it is associated with isolation, depression and anxiety. More information on paranoia, such as causes and symptoms, can be found athttp://depression-guide.com/paranoia.htm. Schizophrenics and people with related mental disorders are constantly paranoid that someone is trying to harm them. A study published in The Lancet Psychiatry was done at the University of Oxford which strongly suggests that cognitive behavioral therapy focusing on worry decreases paranoia and lessens symptoms in schizophrenics after six sessions. The subjects in the study all had severe paranoia that did not respond to medication. The therapy targets low self-esteem and sleep deprivation. By the end of the therapy, they were less fearful of people and happier without the constant worry. This decreased worry lasted for six months. This style of cognitive behavioral therapy included teaching the person to interrupt their worry and distract themselves by doing something else stated Marc Sparks. Being able to take off the heavy blanket of paranoia sounds great.