Period: 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.

If the menstrual cycle is 20 days this time and 40 days next time, and this happens often, some people even have menstruation for 1-2 days, and then another 1-2 days after more than 10 days, and they lose it. If there is no periodicity, this is irregular menstruation.

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 shedding of the endometrium has just begun on the first day, and the shedding of the endometrium increases on the second and third days, and the amount of bleeding also increases. The uterus is stimulated, strengthens contraction, and expels 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, with endless menstruation; some women's menstrual periods are extremely short, passing by in just a "flash". Both of these phenomena are abnormal.

Menstrual blood volume: The amount of a woman’s menstrual blood 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 become soaked quickly after changing, 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 blood can cause anemia, and the cause should be identified and treated. Of course, if the menstrual flow is too low due to abnormalities in the uterus or ovaries or systemic diseases, this situation is not normal, and you should seek medical treatment in time.

Excessive menstruation 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.

Menstrual blood color: Normal blood is dark red. The blood is mixed with small fragments of shed endometrium, cervical mucus, vaginal epithelial cells, and no blood clots. If menstrual blood is as thin as water, only a little pink or black and purple, it is abnormal. If the menstrual blood is completely clotted, it is not normal, and there may be other bleeding areas. You should seek medical attention as soon as possible to ensure your health.

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