Bleeding still in the leukorrhea 30 days after caesarean section may be related to endocrine abnormality, poor uterine regression, poor healing of uterine incision after caesarean section and infection. 1. Endocrine abnormality: In the period of time after delivery, i.e. during the breastfeeding period, endocrine abnormality will be manifested, which will mainly show increased prolactin, low estrogen and progesterone, so some pregnant women will still have the symptom of irregular vaginal bleeding for about 30 days after delivery. 2. Poor uterine recuperation: under normal circumstances, the uterus can be restored to non-pregnancy in 42 days after delivery, and the uterus is still in the recovery period in 30 days after cesarean section, if the uterus and placenta attachment surface recuperation is incomplete at this time, it can cause vaginal bleeding, and the vaginal bleeding is less manifested as blood in the leukorrhea. 3. Poor healing of the uterine incision after cesarean section: this can also cause vaginal bleeding. 4. Infection: Infection of the uterus of the mother after 30 days of caesarean section can cause poor uterine recuperation and poor uterine contraction, which can also cause uterine bleeding. Cesarean section 30 days with blood in the leukorrhea and persistent need to timely hospital treatment, so as not to delay the condition.