There are two days with blood in the milky white leukorrhea, which may be caused by menstruation, but also need to consider vaginal bleeding caused by cervical polyps or cervical erosion. 1. Menstruation: When a small amount of blood suddenly mixes within the milky white leukorrhea and the bleeding appears to increase significantly, then it can be considered as entering the menstrual cycle. Some women may have a small amount of blood mixed in the leukorrhea 2-3 days before their period, which is a normal physiological phenomenon, and it is enough to do a good job of self-care during menstruation. 2. Cervical polyps: Cervical polyps are also a common cause of mixed blood in the leukorrhea. If the cervical polyp grows too fast locally or causes damage to the cervical tissues, it can cause a small amount of bleeding in the vagina and lead to a mixture of blood in the leukorrhea. Vaginal bleeding caused by this type of bleeding is usually small, and there is a clear difference with the amount of menstrual blood. 3. Cervical erosion: Cervical erosion can be regarded as a normal physiological phenomenon of the cervical tissues, which can also cause a small amount of vaginal bleeding in the process of damage or development, resulting in mixed blood in the leukorrhea. The amount of blood mixed in the leukorrhea caused by celiac disease is usually small and does not continue to increase in size, so no specific treatment is usually required. When a woman discovers sudden blood mixing in the leukorrhea, she can first observe whether the amount of her bleeding increases significantly, and at the same time go to the hospital for ultrasound and other examinations to determine the specific cause of the disease.