Vaginal discharge that is like water is most commonly seen in clinical practice for the following reasons: 1. due to bacterial vaginosis, not only is the vaginal discharge thin and watery, it also has a very fishy odor. 2. due to cancer of the fallopian tubes, the discharge is often watery and odorless, and a mass is found in the lower abdomen. 3. due to cancer of the cervix This is due to necrosis of the cancerous tissues of the cervix, so there is a large amount of watery discharge with a foul odor. 4. Cancer of the endometrium can also cause watery discharge, often with a foul odor. 5. Vaginal bladder fistula can also cause watery vaginal discharge, which can be discharged from the vagina without control, and further examination is recommended.