The term “physiological period” generally refers to a woman’s menstruation. Due to the different physical conditions of individuals and the relatively large number of factors affecting them, most normal menstrual cycles last from 21 to 35 days, with an average of 28 days. Normal menstruation is cyclical and self-limiting. The first day of bleeding is the beginning of the menstrual cycle, and the interval between the first day of two menstrual periods is called a menstrual cycle, which usually lasts from 21 to 35 days, with an average of 28 days. The menstrual period usually lasts 2 to 8 days, with an average of 4 to 6 days. The volume of menstruation is the total amount of blood lost during a menstrual period. The normal volume of menstruation is 20 to 60 ml, and more than 80 ml is considered excessive menstruation. In addition, menstruation is also affected by mental and psychological factors. It is recommended to arrange work and rest time reasonably, develop healthy dietary habits, not excessive dieting and weight loss, and have regular medical checkups. If you find a disease, consult a doctor in time, complete the relevant examinations and actively deal with it under the guidance of a specialized doctor.