How long is the normal interval between periods?

Every menstrual period comes, which has become a common thing for many female friends. Generally speaking, most women's menstruation is relatively regular, and it will come at a fixed time every month. So, how long is the interval between two menstrual periods to be considered normal? The following will provide a detailed introduction to this matter.

If the interval between the first day of the second menstruation is more than 21 days, it is normal, but if it exceeds 35 days, it is abnormal. A menstrual cycle of less than 21 days is called too short, and a menstrual cycle of more than 35 days is called too long, both of which are abnormal. The short menstrual cycle is mostly caused by the lack of ovulation. Without ovulation, there is no estrogen, and the uterine wall will experience estrogen breakthrough bleeding under the effect of a single estrogen. Without estrogen resistance, menstruation will occur early. If it exceeds 35 days, it means that the menstruation is infrequent, which may be caused by abnormal ovulation or no ovulation, and further regular examination and treatment are needed.

Reasons why women have a long menstrual cycle: 1. Qi deficiency and blood stasis: If a woman is usually depressed, it will lead to Qi deficiency and blood stasis over time. Or women may be affected by dampness during their menstrual period or after giving birth, which can block the circulation of blood and qi and cause blood stasis. Because blood stasis blocks the uterine vessels, new blood cannot return to the menstruation, resulting in continuous delay of menstruation. 2. Yin deficiency and excessive fire: If a woman has a Yin deficiency constitution, or has been suffering from long-term illness that has damaged her Yin fluid, given birth too many times, or had excessive sexual intercourse, her body will suffer from Yin and blood depletion. Yin deficiency and excessive fire cause blood to be restless, and menstruation cannot function normally, resulting in prolonged menstruation.

Reasons for the reduction of menstrual cycles: 1. Caused by imbalance of neuroendocrine function: mainly due to unstable or defective function of the lower back of the head - ovarian - uterus axis, that is, menstrual disease. 2. Caused by organic diseases or drugs: including inflammation, tumors and growth abnormalities, malnutrition of the reproductive organs; brain diseases; other endocrine imbalances such as thyroid cysts, diabetes, Sheehan's disease, liver diseases; blood diseases, etc.