Adenomyosis occurs when the tissue that normally lines the uterus grows into the muscular wall of the uterus. The displaced tissue continues to act normally — thickening, breaking down and bleeding at during each menstrual cycle. An enlarged uterus and painful, heavy periods can happen. Adenomyosis can cause heavy menstrual bleeding, severe cramping, and sharp pelvic pain during menstruation, chronic pelvic pain, etc. Gynaecologist and Obstetrician treat Adenomyosis.