There occurs a suppression in the generation of gonadotropin releasing hormone (GnRH). The secretion of GnRH normally occurs in a pulsatile fashion, every 60 to 90 minutes. This is absent in<unk> . The function of GnRH is to stimulate the secretion of leutinizing hormone (LH) and follicle stimulating hormone (FSH). As a result, LH and to a certain extent FSH are secreted in low quantities. These hormones are necessary for normal menstruation, and result in<unk>  if not secreted in adequate quantities.
Exercise amenorrhoea
Puberty menorrhagia
Lactational amenorrhea
Premenstrual water retention
Functional hypothalamic amenorrhea
Polycystic ovary syndrome
Endometritis
Premenstrual syndrome