Ovulation may also occur in cases of scanty menstrual flow, and there are several reasons for scanty menstrual flow: 1) scanty menstrual flow caused by estrogen deficiency and endocrine disorders will still ovulate with normal ovarian function. 2) If scanty menstrual flow is caused by incomplete uterine adhesions, ovulation will still occur as well. However, scanty menstrual flow caused by the following conditions is associated with an obstacle to ovulation, such as polycystic ovary syndrome In the case of decreased menstrual flow caused by polycystic ovary syndrome, there will be no ovulation or sporadic ovulation. In addition, ovulation dysfunction can also be caused by decreased menstrual flow if it is caused by ovarian failure. Some of the different causes of decreased menstrual flow will affect ovulation and some will not.