The absence of menstruation on the second day of a period should be considered as a significant decrease in menstrual flow, which should be considered in conjunction with the woman’s previous condition. If there is a history of abortion or removal of the uterus, to rule out the possibility of uterine adhesions, it is best to perform a hysteroscopy. If hysteroscopy reveals adhesions in the uterine cavity, it is best to perform a detachment procedure and apply estrogen after the detachment procedure to further minimize the likelihood of reoccurring adhesions, and it is best to apply an intrauterine device (IUD) for three months prior to the procedure to minimize the likelihood of reoccurring adhesions in a comprehensive manner. Significantly reduced menstrual flow may also be due to ovarian hypoplasia or pituitary gland dysfunction, and appropriate investigations and treatment are required.