Klinefelter syndrome is a genetic condition that arises from the presence of an extra X chromosome in males.

Precocious puberty is a medical condition characterized by an unusually early onset of puberty.

Irregular periods can also be a red flag for eating disorders such as anorexia nervosa and bulimia nervosa.

Puberty is a challenging time for teens, both physically and emotionally.

It is very important for families to understand the normal 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. Menstrual abnormalities that suggest the need for further evaluation are listed.

Early puberty is a condition in which a child begins to develop secondary sexual characteristics, such as breast development or the growth of pubic hair, at a younger age than is typical.