Adenomyosis is a condition where tissue, similar to the lining of the womb, is found within the muscular wall of the uterus. Over time, this can cause the uterus to become enlarged, and for some women, sensitive or painful.
Adenomyosis is different to endometriosis, where tissue that is similar to the lining of the womb grows outside of the uterus, in other places such as the fallopian tubes, pelvic lining or ovaries. While both conditions can cause pain and heavy periods, adenomyosis primarily thickens and enlarges the uterine wall, which can affect implantation and fertility differently from endometriosis. Treatment approaches also vary: adenomyosis often focuses on managing uterine symptoms and optimising the uterine environment for conception, whereas endometriosis treatment may target lesions throughout the pelvis and reduce inflammation.
Because symptoms can overlap with other gynaecological conditions, including fibroids and endometriosis, a specialist assessment is important for an accurate diagnosis.