There are many reasons for sudden blood in the leukorrhea, sometimes cervicitis, cervical polyps, submucosal fibroids, endometrial polyps and uterine fibroids, which can easily cause blood in the leukorrhea. If there is blood in the leukorrhea in the middle of 2 periods, this situation is mostly caused by ovulation bleeding, ovulation bleeding is usually a very small amount of bleeding, lasting 3-4 days will be clean, so if this situation occurs during ovulation, it does not affect the normal life, and does not need to be treated for the time being. If there is blood in the leukorrhea at other times, you should go to the hospital as soon as possible for gynecological examination, ultrasound examination, taking cervical secretions for laboratory tests, and pre-cancer screening of the cervix.