cycle: The average menstrual cycle for women is 28-30 days, but some people have menstruation every 40 days. But as long as there is regularity, it is normal. In addition, menstruation is easily affected by many factors, so it is normal for menstruation to arrive 3-5 days early or late.  

    When a girl reaches menarche, her ovaries have just developed and their functions are not yet complete, so they will experience functional disorders and irregularities. This is not a pathological phenomenon.

    Menstrual period: A woman's menstrual period lasts approximately 2-5 days. The general rule of menstruation is that there is not much menstrual blood on the first day, it increases on the second and third days, and then gradually decreases until the menstrual blood is clean. This is because the first day Uterus The shedding of the endometrium has just begun. On the second or third day, the shedding of the endometrium increases, and the amount of bleeding also increases. The uterus is stimulated, strengthens its contraction, and discharges a large amount of menstrual blood. For some people, after the menstrual blood is gone, it will come again a day or two later, which is commonly known as "return of menstrual blood". This is not a disease, but a normal phenomenon. However, some women’s menstrual periods last for 10-20 days, and their menstruation is endless. ； Some menstrual periods are extremely short and pass by in a flash. Both of these phenomena are abnormal.

    Menstrual blood volume: The amount of a woman's menstrual flow varies from person to person, but is generally 20-100 ml. Generally, changing sanitary napkins or paper 3-5 times a day is considered normal. If the amount of menstrual blood is excessive, the sanitary napkin or paper will soon become soaked again after changing it, and the menstrual blood may even flow down the legs, which is abnormal. Excessive menstrual bleeding may be functional uterine bleeding caused by factors such as excessive mental stress, environmental changes, malnutrition, and metabolic disorders. Long-term excessive menstrual bleeding can cause anemia , the cause should be identified and treated. Of course, if it is due to abnormal uterus or ovaries or systemic disease , causing scanty menstruation, which is also abnormal and should be sought medical attention in time.

    Menorrhagia is more common among adolescent girls. The main reason is that during puberty, the ovarian function is not fully mature, and part of the menstruation at this time is anovulatory. If there is no ovulation, there will be no corpus luteum, and if there is no corpus luteum, there will be a lack of progesterone. Therefore, the endometrium can only be in the proliferative phase and cannot reach the perfect secretory phase, resulting in incomplete shedding of the endometrium, which affects the contraction of the uterus and causes excessive menstrual bleeding. If this situation is not paid attention to, anemia symptoms such as paleness, fatigue, and dizziness may appear over time, and you should seek medical treatment.