In the clinic, we often meet patients who say, “Doctor, I have irregular periods, doctor, I have menstrual disorders, doctor, I have endocrine disorders. So what is menstrual disorder. Let’s take a look at what normal menstruation looks like. Normal menstruation occurs based on the end of luteal life after ovulation, the withdrawal of estrogen and progesterone, which causes the functional layer of the endometrium to crumple and necrosis and shed blood. The normal menstrual cycle is 24 to 35 days, the period lasts 2 to 7 days, and the average bleeding volume is 20 to 60 ml. Anything that does not meet these criteria is considered abnormal uterine bleeding. Do not underestimate these two sentences, many diseases are screened out by just these two sentences. Menstrual disorder is a and general and broad description, a more rigorous talk is abnormal uterine bleeding. First, a menstrual cycle of 24-35 days is considered normal within this range. Some people think that menstrual accuracy means to have a period on time for 30 days, this is a wrong understanding. It is normal to have your period a few days early or a few days late, as long as it has its own regularity. The length of the period plus the amount of bleeding combined is the criterion for judging excessive and excessive menstruation. For example, if some patients say that their periods are clean in two or three days, then according to the above statement we have to see if the amount of bleeding during the menstrual period is really minimal. Combined with these above, many who think they have abnormal menstruation are actually within the normal range. The cycle, duration and blood volume of normal menstruation. It shows a clear regularity and self-limitation. Menstrual disorders may occur when the body is affected by various internal and external factors, such as mental stress, malnutrition, metabolic disorders, chronic diseases, sudden environmental and climatic changes, eating disorders, excessive exercise, alcoholism and other drugs. Menstruation directly or indirectly reflects many physical diseases, when the body endocrine disorders, many are manifested as irregular menstruation, changes in cycle length, changes in the duration of the period, changes in the amount of bleeding, through the examination of menstruation can generally determine the health status of women, so menstruation problems or to cause enough awareness, if there are abnormalities or do not carelessly to seek timely medical help.