Menarche is the onset of the first menstrual cycle in females. Culturally and medically, it is usually indicative of pubescence, as the shedding of the uterine wall indicates fertility. The timing of the phenomenon varies greatly amidst individuals and is affected by environmental, biological and genetic factors, to name a few. The bleeding suggests estrogen-caused growth of the uterus and that the outflow tract that connects the cervix to the vagina is open.
HOW IS MENARCHE DIAGNOSED?
Early onset menarche can be a result of environmental factors, such as constant presence of high-conflict relationships in the home and absence of the father from early childhood.