Irregular menstrual periods are commonly associated with uterine disorders such as fibroids, endometritis, endometrial polyps, or ovarian disorders such as polycystic ovary syndrome. Uterine fibroids usually occur in the interstitial, submucosal, or subplasma layers of the uterus. If the fibroids compress the veins in the attachment of the lesion, causing dilatation or congestion of the endometrial veins, this may lead to heavier periods and longer periods; Endometritis can irritate the lining of the uterus, leading to irregular shedding and menstrual disorders; Endometrial polyps generally refer to polyps in the uterine cavity. Smaller polyps may not affect menstruation, but when they grow to a certain extent, they may cause heavy menstrual flow and prolonged menstrual periods; Polycystic ovary syndrome may stimulate the production of follicular cells and androgens. Excessive androgen secretion may cause follicular atresia, which prevents ovulation, and may result in heavy menstrual periods, delayed cycles, or amenorrhea. In addition, irregular menstruation can also be seen in other diseases, it is recommended to go to the hospital to clarify the cause of the disease under the guidance of the doctor.