<unk>  primarily refers to the biological inability of a man or a woman to contribute to conception. It is defined as the failure to conceive after 1 or more years of unprotected sex.<unk>  may also refer to the state of a woman who is unable to carry a pregnancy to full term.  There are many biological causes of<unk> , some which may be bypassed with medical intervention. Women who are fertile experience a natural period of fertility before and during ovulation, and they are naturally infertile during the rest of the menstrual cycle.  Fertility awareness methods are used to discern when these changes occur; by tracking changes in cervical mucus or basal body temperature.
Infertility
Primary amenorrhea
Secondary amenorrhea
Precocious puberty
Menorrhagia
Salpingitis
Ovarian disease
Delayed puberty