Aunt, how many days is normal?

Under normal circumstances, the duration of a menstrual period is 3 to 7 days, the menstrual volume is 20 to 80 ml, the menstrual cycle is about 28 to 30 days, and the advance or delay of one week is also within the normal range. If the menstrual period is shorter than three days, it means that the menstrual period is too short, longer than seven days, it means that the menstrual period is too long, occasionally there is no big problem, which may be related to factors such as mental stress, rest and irregular diet. If three consecutive menstrual cycles show abnormalities, then it belongs to menstrual disorders, there may be gynecological diseases, such as endocrine disorders or organic lesions, it is recommended to see a regular hospital for gynecological color Doppler ultrasound examination, as well as six items of sex hormone examination.