Adenomyosis is a condition in which the inner lining of the uterus (the endometrium) breaks through the muscle wall of the uterus (the myometrium). Adenomyosis can cause menstrual cramps, lower abdominal pressure, and bloating before menstrual periods and can result in heavy periods. The condition can be located throughout the entire uterus or localized in one spot. Though adenomyosis is considered a benign (not life-threatening) condition, the frequent pain and heavy bleeding associated with it can have a negative impact on a woman's quality of life. Hydrometra is a descriptive term that refers to a distended uterus filled with clear, non-infected fluid. In your case, it can be endometrial fluid