Is menstruation supposed to occur once every month?
Nov 11, 2025
Source: Cainiu Health
Dr. Zhang Lu
Introduction
"Da Yi Ma" usually refers to menstruation. Menstrual cycles typically occur once a month, but there are individual differences; a cycle ranging from 21 to 35 days is considered normal and not strictly fixed at 30 days. To maintain regular menstruation, it's important to develop healthy lifestyle habits, avoid chronic sleep deprivation, maintain emotional stability, and reduce anxiety and stress. In terms of diet, ensure balanced nutrition and avoid excessive dieting or binge eating.
"Da Yi Ma" usually refers to menstruation. Under normal circumstances, menstruation occurs once a month, but there are individual differences; a cycle ranging from 21 to 35 days is considered normal and it is not strictly fixed at 30 days. Detailed analysis is as follows:
The normal menstrual cycle is regulated by hormonal levels in the body. It is measured from the first day of one menstrual period to the first day of the next. Most women have a cycle of approximately 28 days, showing regular monthly periods. A regular menstrual cycle is an important indicator of normal reproductive system function, indicating stable processes of ovarian ovulation, endometrial proliferation, and shedding.
However, the menstrual cycle can be influenced by various factors. For example, in adolescent girls, ovarian function has not yet fully stabilized, so cycles may be irregular, sometimes exceeding 35 days or being shorter than 21 days. In adult women, temporary cycle fluctuations may also occur due to staying up late, excessive stress, emotional changes, or improper diet.
To maintain a regular menstrual cycle, it's important to develop healthy lifestyle habits: avoid chronic sleep deprivation, maintain emotional stability, and reduce anxiety and stress. Nutritionally balanced meals should be maintained, avoiding extreme dieting or overeating. Moderate exercise helps improve overall physical health.
