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). Careful monitoring is done by your physician to avoid this possibility. Also, as with any procedure, a risk of infection exists, you will most likely be given antibiotics to avoid this. 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. There are no proven long-term risks from egg donation. Empirical studies have not demonstrated any definitive link between egg donation and infertility, cancer, or any other significant long-term health problems.