<unk>  occurs when a woman who has been having normal menstrual cycles stops getting her periods for 6 or more months.
Amenorrhea is when a woman does not get her monthly menstrual cycle, or period.
Secondary amenorrhea
Primary amenorrhea
Premenstrual syndrome
Polycystic ovary syndrome
Premature ovarian failure
Chronic pelvic pain
Postnatal depression
Delayed puberty