An 11-year-old girl’s menstruation that doesn’t stop may be caused by hypothalamic hypoplasia, motor factors, thrombocytopenic purpura, aplastic anemia and other causes. 1. As an 11-year-old girl is at the stage of puberty, there is no stable feedback and cyclic regulation established between the pituitary gland, hypothalamus and ovaries. At this time, there are already batches of developing follicles in the ovaries, but due to the immature ovulation mechanism, there is no ovulation, so that the endometrium is in a hyperplasia state, which leads to spontaneous ulceration and bleeding easily, thus leading to the above symptoms. 2. Adolescent girls are prone to inadvertent injuries to the local reproductive organs during exercise, causing bleeding, mistakenly thinking that menstruation has been non-stop, and prompt medical attention is recommended. 3. If she suffers from thrombocytopenic purpura, it may cause excessive bleeding due to the reduction of platelets, which leads to the reduction of blood coagulation mechanism, and if the girl is in her menstruation period, it will also lead to the above phenomenon, accompanied by other symptoms. 4. If you suffer from aplastic anemia, due to the reduction of whole blood cells, which will cause a significant reduction in platelets, if the girl is in the menstrual period, it will also cause persistent menstruation, accompanied by pallor and other symptoms of anemia. 11-year-old girl menstruation has been non-stop should be timely consultation, clear diagnosis and treatment.