Menarche (the first cycle) occurs when the breast has reached development in Tanner stage III or IV. Normally, menarche occurs at the age of 11-14 years. The normal cycle lasts up to 7 days or less, with a quantity of up to 80ml or less, and with a frequency of 21-45 days.
The menstrual cycle occurs when there is a coordinated function of the Hypothalamic - Pituitary - Ovarian axis. The first menstrual cycles are irregular as a result of incomplete maturation of this axis.
95% of hemorrhages in adolescence occur from anovulation. Of these, 55-82% occur within the first 2 years and 20% of them occur in the first 4-5 years.
Any type of hemorrhage that occurs without breast development should be evaluated for some other possible cause.
The causes of prepubertal hemorrhage are diverse, therefore it is necessary to take a careful history and a complete physical examination in order to determine the exact cause, so that appropriate treatment can be undertaken.
1 - Vulvar or external
2 - Vagina
a - Embryonic origin
b - Pelvic organ or pelvic support prolapse
c - Others
3 - Cervix
a - Various infections
b - Others
4 - Benign ovarian tumors