There are many causes of menstrual irregularities. Commonly, there are physiological menstrual irregularities caused by mental and nutritional factors, as well as pathological menstrual irregularities caused by their own diseases, such as endocrine disorders and organic lesions, and may also be caused by medication. Menstruation can only be reassuring if it comes regularly. Early or delayed, too short or too long, too little or too much …… cannot be considered as a proper period, it should come just right. Usually menstruation comes once a month for about 3 to 5 days. It is because it comes on schedule every month that it is called menses, menstruation, etc. Menstrual irregularities are mainly due to changes in the menstrual pattern, which are mainly manifested by abnormal menstrual cycle, abnormal duration and abnormal menstrual volume, as well as other abnormal symptoms before and after menstruation. There are four main causes of menstrual disorders: physiological factors: recent mental stress, poor nutrition and excessive weight loss may lead to hormonal disorders and cause menstrual disorders. In this case, it is recommended to maintain a good state of mind, pay attention to balanced nutrition and avoid excessive weight loss, after adjustment, most of the symptoms of menstrual disorders can be improved. Endocrine disorders: The menstrual cycle is mainly regulated by neuroendocrine regulation, and when there is endocrine disorder, it may lead to early or late menstruation. For example, polycystic ovary syndrome, which is common in clinical practice, may be accompanied by abnormalities such as hirsutism, acne and infertility, in addition to the performance of irregular menstruation. Organic lesions: Mostly uterus-related diseases, such as endometrial polyps, uterine fibroids, endometrium-related tumors, etc. All such diseases can cause irregular menstruation, mostly manifested as dripping menstruation, prolonged periods, irregular vaginal bleeding, etc. Drug factors: The use of some contraceptives, especially emergency/long-acting contraceptives, may cause menstrual irregularities, but menstruation can gradually return to normal after stopping the pill. In short, irregular menstruation is only a symptom, the key is to see the essence through the phenomenon. If you have irregular menstruation, you should actively seek medical advice to find out the real cause of irregular menstruation and treat the cause in order to solve the fundamental problem. In addition, it is recommended that women should develop good habits, maintain a positive and healthy mindset, pay attention to diet and nutrition, and unnecessarily not lose weight, which can avoid the occurrence of physiological menstrual disorders to a certain extent.