Fresh blood after one month’s post-partum discharge may be caused by placenta-placenta residue, poor uterine recovery, pelvic infection and dietary reasons, etc. It is necessary to go to the hospital for gynecological examination and ultrasound, and if there is any abnormality, it is necessary to give treatment. 1. Retained placenta-placenta membrane: when the placenta-placenta membrane in the uterine cavity is not processed cleanly during labor and the residue is peeled off from the uterine wall, there will be bright red bleeding, and ultrasound examination of uterine adnexa can be done in the hospital for a clear diagnosis. 2. Poor uterine recuperation: This may occur when the uterus does not recover well after delivery. 3. Pelvic infection: not paying attention to hygiene after delivery, resulting in bacteria entering the pelvis, causing pelvic inflammation, this phenomenon can also occur, the patient is accompanied by pain in the stomach, the discharge has a fishy odor. 4. Diet-related: eating too much antler, ginseng, cinnamon, etc., may also appear such symptoms. If there is fresh blood after one month of postpartum, it is recommended to go to the hospital in time for examination to clarify the cause of the disease and follow the doctor’s instructions to deal with the treatment.