Severe infections may increase the risk for developing substance-induced psychosis, according to a study conducted in Denmark and published in American Journal of Psychiatry.

“Infections play an important role in psychotic disorders — even in this type of psychosis in which it would otherwise seem straightforward to just say that the psychosis is simply caused by use of substances,” Carsten Hjorthøj, PhD, of the Copenhagen Research Center for Mental Health, told Healio Psychiatry.