A 12-year-old girl has her period for 15 days and it may not stop on its own. At this time, it is considered to be suffering from pubertal dysfunctional uterine bleeding, and it is recommended to go to the hospital for examination and treatment, or else there may be a situation in which the menstruation keeps on dripping. When a 12-year-old girl has her period, the estrogen and progesterone secreted is relatively unstable due to the imperfect function of the ovaries, which will lead to endless menstrual flow. If the menstruation has not stopped after 15 days, it is recommended to have an ultrasound examination to first find out if the uterus is in normal condition. If there is no abnormality, it is also recommended to take a blood test for sex hormone six, mainly to understand the endocrine situation. You can be given medication to stop bleeding and regulate menstruation under the guidance of your doctor. Dysfunctional uterine bleeding during puberty can lead to anemia and shock, and can be treated with drugs such as phenol sulfonamide and tranexamic acid to stop bleeding. At the same time, estrogen and progesterone drugs can be given to regulate menstruation, commonly used drugs are progesterone, estradiol valerate tablets and so on. In daily life, we should do a good job of dietary adjustments, maintain a good state of mind, and should also avoid overwork, stay up late, and get more rest.