The article demonstrates approaches to the diagnosis and treatment of intestinal endometriosis with a complication in the form of intestinal bleeding. In the first case, intestinal bleeding in a young woman was caused by endometriosis through germination of the sigmoid colon wall, which is a classic example of a combined lesion of endometriosis of the pelvic organs. The second case describes a rare variant of intestinal bleeding caused by endometriosis of the duodenum in a woman during the menopausal transition.