How to calculate the number of days between two menstrual periods

Under normal circumstances, a woman's menstruation lasts about three to seven days, and she will have her period once a month. However, because each woman's physical condition is different and is affected by different factors, the timing of some women's menstrual cycles is not very accurate. There may be problems with early or delayed menstruation, so the specific cycle time is different. So how should the number of days between two menstrual periods be calculated?

1. The normal menstrual cycle is about 28 days, which means it occurs once a month. There is a physiological fluctuation in the middle, so it is normal for the period to come earlier or later. If the first menstruation is on the 1st, then the next menstruation will also be on the 1st. It is normal to have menstruation within a week before or a week after the 1st, and it is not considered a pathological menstrual cycle. However, if it occurs a week earlier or a week later, it should be considered as irregular menstruation. Due to individual differences, some women have their periods every two months or forty days. As long as it is regular, it is normal for the individual.

2. The length of menstrual cycle varies from woman to woman. If the menstrual cycle is 7-10 days earlier or later, it is within the normal range. As long as a certain regularity is maintained, it is not considered as irregular menstruation. The menstrual cycle, also known as the ovarian cycle, is divided into four stages, including the follicular phase, ovulation phase, luteal phase and menstrual phase. The specific calculation method for the number of days of menstruation is from the first day of this menstruation to the first day of the next menstruation, which is called the menstrual cycle. It is generally 28-35 days, with a clean period of 3-7 days. It is normal to exceed or delay it by 1 week.

3. The timing varies depending on individual physical differences and genetics. Menstruation lasting less than 22 days indicates that the menstrual cycle is too short and requires regular treatment with menstrual regulating drugs. If the period exceeds 35 days, exclude unexpected conception. If the cycle is prolonged, consider endocrine hormones, gynecological inflammation and polycystic ovary. Irregular menstruation will reduce the chance of conception during the pregnancy preparation period. Go to the hospital as soon as possible to have sex hormone and color ultrasound examinations, and use medication to treat the cause.