What's going on when your period comes and goes away?

Normal menstruation is 21 to 35 days of menstruation once, normal menstruation is 3 to 7 days, less than three days is too short period, more than seven days is too long period, are abnormal circumstances, a normal menstrual volume is 5 to 80 ml, 5 to 80 ml concept is 15 to 20 daily sanitary napkins, if a menstrual period even a daily sanitary napkin can not be soaked, then that is too little menstrual volume, is definitely abnormal. Do not know what you said less menstrual volume, whether less than even a daily sanitary napkin can not be soaked. If the performance of such a situation, if there is a sexual life of women first to rule out pregnancy, because sometimes abnormal uterine bleeding, just in the menstrual period when the performance, people will mistake it for menstruation. Excluded pregnancy, clinical menstrual volume reduction more common in the occurrence of follicular dysplasia or ovulation disorders, which need to go to the hospital for further examination to /confirm/i.