Perhaps the greatest risk associated with<unk>  is ovarian<unk>  syndrome (OHSS). OHSS occurs when, following a "trigger" injection for final oocyte maturation, excessive VEGF production by numerous follicles acts systemically. This can result in a shift of fluid from the bloodstream to "third spaces", including the belly and the space around the lungs. This can make it difficult and painful to breathe or move, and in extremely rare cases can be fatal. Severe cases often require hospitalization, removal of fluid from the abdomen, and replacement of fluid in the blood. OHSS is most prevalent in very high responders, almost always those with more than 20 developing ovarian follicles, who are triggered with hCG. One means of greatly reducing OHSS risk is to trigger with GnRH agonist instead of hCG. This results in a surge of LH from the pituitary, the same hormone that matures the eggs in natural cycles. LH has a much shorter half-life than hCG, so that nearly all of the LH is cleared by the time of egg collection, or about 36 hours after trigger. Any developing signs of OHSS will typically vanish at that point. However, in rare cases, severe OHSS can continue to develop. Reduced success rates have been reported in fresh embryo transfers when the agonist trigger is used without hCG, so that most centers will freeze all embryos in cycles triggered only with the agonist. Ovarian<unk>  does not seem to be associated with an elevated risk of cervical cancer, nor with ovarian cancer or endometrial cancer when neutralizing the confounder of infertility itself. Also, it does not seem to impact increased risk for breast cancer.
Controlled ovarian hyperstimulation
Ovarian stimulation
Postpartum confinement
Menstrual extraction
Vasectomy reversal
Oxytocin
Oxytocin 
Anovulatory cycle