Cannabis psychoses in south Sweden.
Eleven patients with a psychosis in connection with cannabis abuse admitted to two mental hospitals during 1 year were examined. Patients with a pre-existent psychosis or a mixed abuse were excluded. The patients were divided into three groups: acute, subacute and chronic. The features of the disease were essentially similar in all patients, with a mixture of affective and schizophrenia-like symptoms, confusion and a pronounced aggressiveness. The course as a rule was self-limiting leaving no residual symptoms. There was almost no heredity of severe mental disease. The symptoms were very similar to those seen in cycloid psychosis, and a possible relationship between the two diseases is discussed. As regards the widespread abuse of cannabis we conclude that psychosis is a rare complication but that in unclear psychotic states it is recommended to actively search for a cannabis psychosis.
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000150:complications* / Q000453:epidemiology; D011379:Prognosis; D011605:Psychoses, Substance-Induced / Q000453:epidemiology / Q000523:psychology*; D012306:Risk; D013548:Sweden