London ? If you think they’re out to get you, you’re not alone.

Paranoia, once assumed to afflict only schizophrenics, may be a lot more common than previously thought.

According to British psychologist Daniel Freeman, nearly one in four Londoners regularly have paranoid thoughts. Freeman is a paranoia expert at the Institute of Psychiatry at King’s College and the author of a book on the subject.

Experts say there is a wide spectrum of paranoia, from the dangerous delusions that drive schizophrenics to violence, to the irrational fears many people have daily.

“We are now starting to discover that madness is human and that we need to look at normal people to understand it,” said Dr. Jim van Os, a professor of psychiatry at Maastricht University in the Netherlands. Van Os was not connected to Freeman’s studies.

Paranoia is defined as the exaggerated or unfounded fear that others are trying to hurt you. That includes thoughts that other people are trying to upset or annoy you, for example, by staring, laughing or making unfriendly gestures.