If there is yellow watery leukorrhea in the vagina, it must cause great attention, because it is often caused by the following reasons: 1. Cancer of the fallopian tube. Cancer of the fallopian tube will often show the phenomenon of vaginal discharge, and the leukorrhea does not have any peculiar smell. Ultrasound is recommended to rule out the possibility of tumors in the adnexal region.2. Due to cervical cancer. For example, due to cervical cancer, it will lead to large amount of localized exudation from the cervix, which will be accompanied by bloody leukorrhea.3. Watery leukorrhea caused by endometrial cancer. When endometrial cancer is in the advanced stage, when there is watery leukorrhea combined with infection, the leukorrhea will be accompanied with bad smell. Therefore, for this kind of leukorrhea, it is recommended to do cervical cancer screening, ultrasound examination and diagnostic curettage if necessary. In addition, it is also recommended to do routine examination of leukorrhea to exclude the possibility of vaginal inflammation.