Adenomyosis

[Monty]

In adenomyosis, tissue from glands in the lining of the uterus (endometrium) grows into the muscular wall of the uterus. The uterus becomes enlarged, sometimes doubling or tripling in size.
How many women have adenomyosis is unclear, partly because it is hard to diagnose.
Adenomyosis causes symptoms in only some women, usually those aged 35 to 50. Some women with adenomyosis also have endometriosis or fibroids.
The cause of adenomyosis is unknown. Adenomyosis may be more common among women who have had more than one pregnancy.