Ovulation injections are mainly used to encourage follicles to develop and mature and to encourage follicles to be expelled. In some patients who are monitored for ovulation in natural cycles, the follicles are slow to develop and can be given ovulation injections to allow the follicles to develop normally. Patients who undergo IVF can receive ovulation injections to allow multiple follicles to develop at the same time. After the follicles have matured, the eggs are removed from the body through an egg retrieval procedure, formed into embryos with sperm in the laboratory, and then transferred to the mother’s uterus to make her pregnant. The injections used to promote ovulation are follicle stimulating hormone and luteinizing hormone, which make the follicles grow, and another kind of injection called chorionic gonadotropin, which is the injection that promotes the expulsion of the follicles. Which injections should be used and how to use them should be prescribed by a fertility doctor at the hospital. These injections can promote follicle development when used properly, but they should not be used indiscriminately, because too many injections to promote ovulation can lead to complications when many follicles develop. This complication is called ovarian hyperstimulation syndrome, the patient will have abdominal pain, abdominal distension, ascites, and even pleural fluid, which can be life-threatening, so ovulation needles should not be used indiscriminately.