
It is important for clinicians to have an understanding of the menstrual patterns of adolescent girls, the ability to differentiate between normal and abnormal menstruation, and the skill to know how to evaluate the adolescent girl patient. Identification of abnormal menstrual patterns in adolescence may improve early identification of potential health concerns for adulthood. Clinicians should educate girls and their caretakers (eg, parents or guardians) about what to expect of a first menstrual period and the range for normal cycle length of subsequent menses. A number of medical conditions can cause abnormal uterine bleeding, characterized by unpredictable timing and variable amount of flow. Environmental factors, including socioeconomic conditions, nutrition, and access to preventive health care, may influence the timing and progression of puberty. population, median age at menarche has remained relatively stable-between 12 years and 13 years-across well-nourished populations in developed countries.

ABSTRACT: Despite variations worldwide and within the U.S.
