Excessive menstrual flow may lead to iron deficiency anemia, shock, pelvic infection and other hazards. 1. Iron deficiency anemia: blood contains hemoglobin, hemoglobin contains iron, if the menstrual flow is too much for a long time, it may lead to iron deficiency anemia, with clinical manifestations of pale eyelids, dizziness and fatigue, etc., which needs to be treated in time while subsidizing the treatment of the primary disease. 2. Shock: If the amount of menstruation is too much in a short period of time, it may cause shock, which is clinically manifested as fast pulse rate, fainting, cold and wet limbs, etc., and requires timely rehydration and anti-shock treatment. 3. Pelvic infection: excessive menstrual flow will lead to a decline in body resistance, there may be reproductive tract pathogenic bacteria breeding, causing upward pelvic infection, clinical manifestations of fever, abdominal pain, leukorrhea and other symptoms, if pelvic inflammatory disease is not detected and treated in time, it may affect the normal pregnancy. It is recommended that people with heavy menstruation should consult a doctor in time to determine the cause of the disease and then treat it in time so as not to affect their health.