What causes adenomyosis?
Specifically, adenomyosis happens when the tissue that lines your uterus (called endometrial tissue) forms nodules. Nodules are like tiny masses of cells that form where they should not. Usually, if you have adenomyosis, your uterus will be enlarged. You may have painful or heavy periods, bleeding between periods, or you may have no symptoms at all.
Symptoms of adenomyosis
Talk to your doctor if you have symptoms of abnormal uterine bleeding, including painful periods, heavy bleeding during your period or other problems associated with your monthly cycle. Your doctor will likely do a physical exam to see if your uterus is enlarged. They will also see if the uterus contracts normally and if it is spongy to the touch—both symptoms of adenomyosis.