Injections to promote ovulation do not need to be given every day. If it is used to induce ovulation in women, the injection is usually given for 7 consecutive days starting on the 3rd to 5th day of withdrawal bleeding or menstruation, as prescribed by the doctor. Ovulation induction injections mainly contain follicle stimulating hormone and luteinizing hormone, which are used to supplement gonadotropin deficiency. Follicle stimulating hormone stimulates follicle growth and maturation, while luteinizing hormone induces ovulation and stimulates the development of the corpus luteum. When used to induce ovulation in women, the course of use is accompanied by ultrasound to monitor the development of the follicles. The majority of the typical course of use is less than 10 days. The use of ovulation injections often results in the simultaneous development of multiple follicles. Enlargement of the ovaries and rupture of the follicles may also lead to accumulation of blood and pain in the uterine cavity. In addition, ovulation injections should be used under the guidance of a doctor and should not be used at random.