Anovulatory haemorrhage is known as anovulatory dysfunctional uterine bleeding.
Anovulatory dysfunctional haemorrhage is most commonly seen in women during puberty and menopausal transition. This is due to the immaturity and defects in the hormonal regulation mechanisms of adolescent women, which can result in follicles failing to develop and mature, hence anovulation occurs.
During the menopausal transition, the ovaries continue to decline and the follicles are almost depleted (the number of follicles available in a woman’s lifetime is limited), the remaining follicles are not hormonally sensitive and therefore do not ovulate.
Both of these conditions of non-ovulation result in a single elevation of oestrogen without progesterone antagonism, resulting in the endometrium not being able to proliferate and shed normally on a cyclical basis, causing anovulatory dysfunction.