The absence of ovulation during the ovulation period can be caused by a variety of reasons: 1. It may be caused by changes in hormone levels in the body, and other problems, in the process of follicular development, if the level of estrogen in the body is high, it may lead to the emergence of ovarian cysts, and therefore there will be the symptom of the absence of ovulation. 2. It may be caused by the usual mental stress, irregular living habits and poor diet, and a variety of aspects. The factors that lead to the inability to ovulate. 3, may also be due to other physiological diseases and other problems, such as ovarian dysplasia, premature ovarian failure or ovarian function decline and other problems caused by these conditions, when these conditions occur, may also lead to ovulation is not good. 4, the body resistance to decline or other factors, may also lead to the emergence of abnormal problems, it is recommended to go to the hospital in a timely manner to carry out examinations, monitoring their ovulation, and do the relevant work to promote ovulation. Do the relevant work to promote ovulation.