Endometriosis is one of the most important gynecologic disorder in adolescent and reproductive age women. The laparoscopic and pathologic investigation is necessary for the diagnosis of endometriosis. The prevalence of laparoscopically diagnosed endometriosis in adolescents ranged widely from 19-70%. The exact prevalance of endometriosis in adolescent is unknown and based on estimate. The diagnosis of adolescent endometriosis has been identified based on history, physical examination, and pelvic ultrasonography. Endometriosis should be considered in patients with persistent, clinically significant dysmenorrhea, cyclic/acyclic chronic pelvic pain despite treatment with medical options. Family history, obstructive genital abnormalities and neonatal bleeding is most popular aetiologic factors in adolescent endometriosis. All stages forms of endometriosis (including endometrioma and deep infiltrating endometriosis) are found in adolescent. The first line treatment options in adolescent endometriosis is surgical (If laparoscopy is to be undertaken) (laparoscopic ablation/excision) and medical (NSAIDs (nonsteroidal antiinflammatory drugs), progestins and COC (Combined Oral Contraceptive Pill)). Therapy must be individualized