One estimate is that 10.8 million people are affected globally . Other sources estimate 6 to 10% of the general female population and 2 to 11% of asymptomatic women are affected. In addition, 11% of women in a general population have undiagnosed endometriosis that can be seen on magnetic resonance imaging (MRI). Endometriosis is most common in those in their thirties and forties; however, it can begin in girls as early as eight years old. It results in few deaths with unadjusted and age-standardized death rates of 0.1 and 0.0 per 100,000. Endometriosis was first determined to be a separate condition in the 1920s. Before that time, endometriosis and adenomyosis were considered together. It is unclear who first described the disease.
One estImaTe iS tHat 10.8 milLiON PEopLe arE affecTeD gLobAlLY . oTher soUrceS eStImAte 6 tO 10% OF ThE geNeral femaLe pOPulAtioN and 2 tO 11% oF aSymPtoMATIC WomeN are AffeCteD. in ADdition, 11% oF woMeN in A geneRaL PopuLatiOn hAve uNDiaGNosed eNdOmetRiosIS ThaT cAN bE sEEn oN MaGnETiC resonancE imaGIng (MRi). eNDOmetriosIS is most ComMOn In tHoSe in ThEIr ThirtIes and fortIeS; howEver, it caN begIn IN giRls AS Early As EiGhT years Old. it rEsults in feW deatHs wiTh uNAdJUsTed and Age-stANDardized death rAtes oF 0.1 and 0.0 PEr 100,000. enDomEtriOsis Was fiRst dEtermineD to be a separate conDItiOn In The 1920s. bEFore thaT tIme, enDOmetRiOsis and adENomYosIs werE ConsidEreD togEther. It iS unclEar who fiRst dEsCRIbeD The DisEasE.