Abnormalities of the type of bleeding may be a serious problem for adolescent girls. Menorrhagia or metrorrhagia are disturbing in daily life and may contribute to psychological insecurity. Hypermenorrhea and menorrhagia are uncomfortable and can lead to anemia and iron deficiency. The same applies to polymenorrhea, even if it is combined with menorrhagia.

The other abnormality of rhythm, oligomenorrhea, can be an early sign of endocrine abnormalities with possible consequences for clinical care and future reproduction. This is an important aspect. In addition, oncologic and metabolic problems should be considered. A diagnosis should be reached especially in girls with oligomenorrhea in order to detect a relevant endocrine, organic, metabolic or coagulation problem.