There are certain differences between endometriosis and chocolate cysts, and the main differences are as follows: first, endometriosis refers to endometrial tissue that appears outside the uterine cavity and is a lesion reaction; chocolate cysts refer to the endometrium appearing on the ovaries to form cysts, and these two diseases are produced in different locations. Secondly, chocolate cyst is a symptom of endometriosis. Although both diseases produce menstrual pain, the location of the pain is different: endometriosis is located in the pelvic cavity and produces obvious pain when having sexual intercourse; chocolate cyst patients have less obvious pain during sexual intercourse. Thirdly, the treatment methods of the two diseases are different, and the location of the drug action is also different, so timely examination and judgment is needed to be able to treat the symptoms.