Pelvic endometriosis can easily affect the ovaries. The ectopic endometrium bleeds periodically in the ovarian tissue, causing the ovaries to continue to grow and form chocolate cysts. This cyst is often bilateral. Ovarian chocolate cysts rupture spontaneously or under the influence of external forces due to a variety of factors, and rupture can occur repeatedly. After rupture, old blood overflows into the abdominal cavity, causing severe abdominal pain, nausea and vomiting, etc., and emergency treatment is often required. Cyst rupture often occurs before menstruation and during menstruation. Ovarian chocolate cyst rupture is a new type of acute abdomen in the field of gynecology. In the past, it was not well known and was often ignored. Now that we have a deeper understanding of it, it has attracted attention.