Adenomyosis
A condition in which endometrial tissue grows into the muscular wall of the uterus, causing the uterus to become enlarged, tender, and dysfunctional. Symptoms include severe menstrual pain, heavy bleeding, and reduced fertility — implantation rates drop significantly in severe cases.
When adenomyosis is unresponsive to medical or surgical treatment and pregnancy attempts remain unsuccessful, gestational surrogacy with the intended mother's own eggs becomes a valid pathway to parenthood.