Causes of ovulatory infertility include follicular immaturity, ovulation dysfunction, and blockage of the fallopian tubes. Women who have been living without contraception for at least 12 months without conceiving are called infertile. Infertility is generally categorized into two main types: primary infertility if there has never been a history of pregnancy in the past and secondary infertility if there has been a history of pregnancy without contraception for 12 consecutive months without conceiving. There are many common causes of infertility, and the common causes of female factors are: 1. During ovulation, if the follicle development is immature, there will be no mature follicle formation, and the egg will not be discharged, which will affect pregnancy and may cause ovulation infertility. 2. Ovulatory dysfunction: for example, luteinized unruptured follicle syndrome is an ovulatory dysfunction in which the follicles are mature and the follicular cells are luteinized, the patient’s basal body temperature is biphasic, and the endometrium is in the secretory phase of the change, but the mature eggs cannot be discharged and there is no possibility of conception. 3. When female patients have tubal blockage caused by various diseases such as salpingitis and tubal tuberculosis, the combination of sperm and egg will be hindered, and the fertilized egg cannot be formed, which will affect pregnancy and may cause ovulatory infertility. Ovulatory infertility has more causes, as well as male factors, and requires examination and treatment under the guidance of a medical professional.