Bleeding after 7 days after miscarriage and again after 4 days may be caused by incomplete uterine regrowth and uterine residue. 1. Incomplete uterine regeneration: miscarriage is a spontaneous abortion that occurs before the 28th week of pregnancy. Incomplete uterine regeneration after miscarriage will reopen the blood sinuses on the placental attachment surface, resulting in prolonged vaginal bleeding, which can be diagnosed with ultrasound examination, and medications such as hysteronin need to be given to promote uterine contraction as prescribed by the doctor. 2. uterine cavity residue: when the uterine cavity after the miscarriage residual meconium, placenta and other tissues, can also cause vaginal bleeding for a long time, ultrasound can help diagnosis, need to comply with the doctor’s instructions to give the uterus and other drugs to promote uterine contraction treatment, and is conducive to the discharge of the evil discharge, the need to clear the treatment if necessary. When there is bleeding after 7 days after the miscarriage and again after 4 days, it is necessary to go to the hospital to find out the cause and actively deal with it.