How far can endometriosis spread?

Dr Sarah Jarvis MBE If endometriosis is left untreated, it becomes worse in about 4 in 10 cases. It gets better without treatment in about 3 in 10 cases. For the rest it stays about the same. Endometriosis is not a cancerous condition. For more information on endometriosis, go to https://patient.info/health/pelvic-pain-in-women/endometriosis