If you have a period at the age of 14 and it does not clear up in half a month, you have functional uterine bleeding during puberty. Since the child is relatively young, the hypothalamic-pituitary-ovarian axis is still immature, which may be caused by the absence of normal ovulation, and it is necessary to go to the hospital for treatment at this time. This phenomenon can be treated with medication at the hospital, which means that estrogen and progesterone sequential therapy can be applied to regulate menstruation and stop bleeding, and short-acting oral contraceptives can also be applied, both of which are very effective in treating functional uterine bleeding in girls.