Adenomyosis is a common co-condition of endometriosis and can be a huge source of pelvic pain. Adenomyosis is not the same disease as endometriosis (some people say it’s endometriosis of the uterus but it’s not). Adenomyosis is defined as “the presence of endometrial glands and stroma found within the myometrium.” (Definition source: CEC website.) Basically, it’s when the endometrium (inner lining of the uterus) invades the muscular portion of the uterine wall.
Adenomyosis can have overlapping symptoms with endometriosis, and for some people is a source of continued pelvic pain post-excision.