Irregular periods can be caused by a variety of reasons, such as changes in a woman’s environment, increased stress in life or emotional changes, which can cause irregular periods. Endocrine disorders, such as ovarian decline and polycystic ovary syndrome, can cause irregular menstruation. Therefore, if a woman has irregular menstruation, she should go to the hospital in time and see a doctor for appropriate examinations, such as ultrasound examination to understand the condition of the uterine appendages and the endometrium, and hormone tests 2-4 days after the onset of menstruation to understand the function of the ovaries. For the specific reasons of the examination, it is better to give medication to effectively regulate the menstrual cycle.