The following are common causes of heavy menstruation during breastfeeding: 1) endocrine disorders: clinically referred to as dysfunctional uterine bleeding; 2) fetal residues: after birth, the placental tissue or residues are not discharged; 3) poor contraction of the uterus; 4) combined with other gynecological diseases: such as uterine fibroids, adenomyosis, and intrauterine devices. For example, if the menstrual flow is caused by endocrine diseases, we should check the sex hormones and thyroid function to see which hormones are abnormal and deal with them accordingly. If there is a residual fetal material found in the ultrasound after delivery, take oral medication or a hysterectomy, and then observe. Some people are afraid to have their uterus cleaned out when they hear about residual fetus. If you can’t get rid of it, you should wait for a period after weaning to see if it can be removed together with your period. If it is not cleared, only then will we consider the use of a curettage, and it will be done under hysteroscopy. If the heavy menstrual flow is caused by poor contraction of the uterus, take the Chinese herbal medicine Yimu Cao tablets, Biochemistry Pills and Xie Zhi Capsules. If there is a combination of other gynecological diseases, such as uterine fibroids, which cause heavy menstruation, especially if it causes anemia, surgery may be necessary and the doctor will handle it according to the situation and wishes. If you have a high menstrual flow with an IUD, you will slowly adapt to the IUD within six months and your menstrual flow will become normal after six months. If it does not change to the normal amount of treatment is also to eat some proprietary Chinese medicine to regulate, such as motherwort tablets, naproxen anti-inflammatory drugs, and Wuji Baifeng pill is also possible.