Prolonged menstruation in a 12-year-old girl may be caused by immaturity of the hypothalamic-pituitary-ovarian axis, which is a normal phenomenon. If the prolonged periods are caused by uterine fibroids or adenomyosis, they are abnormal.
The immaturity of the hypothalamic-pituitary-ovarian axis in a 12-year-old girl will result in irregular ovulation of the ovaries, which may lead to menstrual irregularities such as long menstrual cycles, prolonged menstrual periods, heavy menstrual periods, and scanty menstrual periods. This is a normal physiological phenomenon and does not require treatment. Generally, as the hypothalamic-pituitary-ovarian axis matures with age, menstruation will become normal.
In addition, 12-year-old girls with uterine fibroids may show prolonged duration of menstruation, heavy menstruation, short intervals between menstruation cycles, so that the patient has the symptom of prolonged menstruation. In addition to this, 12 year old girls presenting with adenomyosis may also experience prolonged periods, dysmenorrhea, and increased menstrual flow.
There may be other reasons for 12-year-old girls to have prolonged menstrual periods, so they need to consult a doctor for examination, clarify the cause of the disease under the guidance of a professional doctor, and choose the appropriate measures to treat the disease.