[ABSTRACT] Many papers have been published on the topic of the epidemiology of bipolar disorders; however, due to methodological difficulties of the studies and the absence of common approaches and unified measure instruments, the results have been quite different. In this paper we will try to expose those epidemiologic data more accepted, like prevalence, incidence and risk factors as sex, onset-age, socio-economic status, civil state, influences of cultural, ethnic or religious status, just as