As with many medical procedures, there are always risks and possible side effects. The primary risk is a condition called Ovarian Hyper-stimulation Syndrome. This is relatively rare (1-3% of cases). and careful monitoring is done by your physician to avoid any repercussions. Common side effects that donors may or may not experience from the medications include headaches, mood swings, bloating, nausea, and/or temporary stinging where the injection was administered. At this time, there are no proven long-term risks from egg donation.