Menstruation refers to menstruation, and a girl’s menstrual period usually lasts 2 to 8 days, with an average of 4 to 6 days. Normal menstruation is cyclical and self-limiting, and the duration of each period is called the menstrual period. A woman’s menstrual period is affected by a variety of factors, such as heredity, mental stimulation, hormone levels, etc. Generally speaking, the menstrual period lasts for 2 to 8 days, with an average of 4-6 days. Due to individual differences, the normal duration of a girl’s period fluctuates within this range. If there are endocrine abnormalities or organic lesions, there may also be shortened or prolonged periods, or even accompanied by changes in menstrual flow. Therefore, for patients with shortened or prolonged periods, it is recommended that they go to the hospital for ultrasound, sex hormones and other relevant examinations to determine the cause of the disease and then actively treat it under the guidance of the doctor.