Cancer treatment can temporarily or permanently affect your fertility, depending on the type and stage of cancer, the kind of treatment you undergo, and your age at the time of treatment.
Surgery: If your ovaries, uterus, or testicles are surgically removed, then it will definitely harm your fertility.
Chemotherapy: The effect of chemotherapy on your fertility depends on the drugs used, the dose given, and your age. It can also cause genetic effects on the oocyte resulting in aneuploidy and early embryonic mortality.
Radiation: Depending on the area, dose, and size of the radiation field, it can be more harmful to fertility than chemotherapy.