oligomenorrhoea

Masculinization is preceded by anovulation, oligomenorrhoea, amenorrhoea and defeminization.

Oligomenorrhea (or oligomenorrhoea) is infrequent (or, in occasional usage, very light) menstruation.

Hyperprolactinaemia, or excess serum prolactin, is associated with hypoestrogenism, anovulatory infertility, oligomenorrhoea, amenorrhoea, unexpected lactation, and loss of libido in women, and erectile dysfunction and loss of libido in men.

Hartz et al showed that in about 12 000 American women aged 20-39 years participating in a slimming programme the degree of obesity and waist-hip ratio were independently and positively related to the prevalence of reported irregular menstruation, oligomenorrhoea (cycles longer than 36 days), and hirsutism.

A review of type 1 diabetes came to the result that, despite modern treatment, women with diabetes are at increased risk of female infertility, such as reflected by delayed puberty and menarche, menstrual irregularities (especially oligomenorrhoea), mild hyperandrogenism, polycystic ovarian syndrome, fewer live born children and possibly earlier menopause.