What is the reason for the amount of menstruation after the upper ring

Increased menstrual flow after placement of IUD is a common side effect, IUD will stimulate women's endometrium to cause non-inflammatory hyperplasia, it will lead to increased menstrual flow or prolonged menstruation phenomenon, this is normal, if there is no other performance can not be treated, more in 3 to 6 months after self-improvement.