How to calculate the menstrual cycle and what kind of menstrual cycle is normal

How to calculate menstrual cycle? What kind of menstrual cycle is normal?

1. Menstruation is the periodic shedding of endometrium and bleeding through the vagina during a woman's entire reproductive life. Every month or so, the endometrium undergoes a periodic change of thickening, blood vessel proliferation, glandular growth and secretion, and endometrial necrosis and shedding accompanied by bleeding. This physiological cycle is called the menstrual cycle.

2. The calculation of the menstrual cycle is very simple. Female friends only need to record carefully: the first day of bleeding is the beginning of the menstrual cycle, and the interval between the first days of two menstruations is called the menstrual cycle.

3. Some female friends have their periods twice a month, and they don’t know if it is normal. So what kind of menstrual cycle is normal? In fact, 7-10 days early or late can be considered normal. As long as a certain regularity can be maintained, it cannot be considered irregular menstruation. The menstrual cycle starts on the first day of menstruation and ends with the next menstruation. The length of the cycle varies from person to person, ranging from about 21 to 36 days, with an average of about 28 days. The duration of menstruation is generally 3-7 days, with an average of 5 days. The menstrual cycle is divided by the ovulation day into the follicular phase before ovulation and the luteal phase after ovulation. The length of the follicular phase is not fixed, but the luteal phase is fixed at about 14 days before and after two days.

4. The length of the menstrual cycle depends on the length of the maturation period of the follicles in the female ovaries, and the length of the luteal phase is roughly the same, about fourteen days. If the follicle development period is long, the menstrual cycle is long, and vice versa. Under normal circumstances, an ultrasound examination during the ovulation period in the middle of the menstrual cycle will observe a dominant follicle with a diameter of ≥18 mm. Only with mature follicles will ovulate. If female friends suspect that the menstrual cycle is abnormal, it is recommended to go to a regular obstetrics and gynecology department to check the endocrine situation and adjust the menstrual cycle scientifically based on the examination results.