Onset of menstruation (i.e., menarche) is a determining event of the adolescent female signifying the progress of puberty, which in the majotity of cases is visibly initiated with thelarche (onset of breast development or breast buds). Menarche usually occurs during the earlier time of the second decade of life and ends with menopause, typically in the 5th decade of life. The adolescent can present with a wide variety of menstrual dilemmas and disorders which will be discussed in this chapter.
Greydanus, Donald E.; Omar, Hatim A.; Tsitsika, Artemis; and Patel, Dilip R., "Menstrual Disorders in Adolescent Females" (2010). Pediatrics Faculty Publications. 263.