Women may choose to freeze their eggs for medical reasons, such as when they need to undergo cancer treatment or have a medical condition that could impact their future fertility. Radiation therapy and chemotherapy are two common medical reasons for egg freezing. Radiation treatments use high energy rays to kill rapidly dividing cells localized to a certain area, such as the pelvis, which can cause the ovaries to absorb much of the radiation dose. Chemotherapy works to kill diving cells in the body via cytotoxic medication, such as cisplatin, doxorubicin, and cyclophosphamide, that affects the entire body. Oocytes are cells that divide quickly and are often highly impacted by chemotherapeutic agents, which can lead to early menopause or premature ovarian insufficiency. Women who have a family history of early menopause or primary ovarian insufficiency may also consider egg freezing.