syndrome is a condition in which the woman does not produce enough follicle stimulating hormone and excessively produces androgens. This results in the ovulation period between contact of the egg being postponed or excluded. Autoimmune disorders can lead to complications in implantation of the egg in the uterus, which may be the immune system’s attack response to an established embryo on the uterine wall. Cancer ultimately affects fertility and may lead to birth defects or miscarriages. Cancer severely damages reproductive organs, which affects fertility. Endocrine system disorders affect human fertility by decreasing the body’s ability to produce the level of hormones needed to successfully carry a zygote. Examples of these disorders include diabetes, adrenal disorders, and thyroid disorders. Endometriosis is a condition that affects women in which the tissue normally produced in the uterus proceeds to grow outside of the uterus. This leads to extreme amounts of pain and discomfort and may result in an irregular menstrual cycle. See also Spontaneous conception, the unassisted conception of a subsequent child after prior use of assisted reproductive technology Development of the human body References External links Fertilization (Conception) Fertility