There are egg donors who have experienced hair loss, thyroid and other hormone imbalances, weight gain, sciatica pain, muscle loss, infertility, PCOS, endometriosis, cancers.
Ovarian Hyperstimulation Syndrome (OHSS) is a complication of fertility treatments, particularly IVF, where the ovaries become enlarged and release fluid into the body. It can range from mild discomfort to a serious condition requirement hospitalization.
The Guardian April 2006: Cruel cost of the human egg trade