The majority of women will not experience side effects while undergoing egg preservation; for those that do, the effects are minor and short-term. Occasionally, ovarian stimulation hormone injections can lead to OHSS, ovarian hyperstimulation syndrome, which causes the ovaries to swell and can be painful. However, under current protocols, this risk is very low. Studies done so far have found no evidence of longer-term health risks associated with egg freezing, and your fertility will not be impacted.