If the leukorrhea is like water, it is often caused by the following reasons:1. Vaginal inflammation, such as bacterial vaginosis, will make the leukorrhea thinner and watery, and it will be accompanied by a big fishy smell.2. Caused by cervical cancer, due to the advanced stage of cervical cancer will lead to an increase in the vaginal secretion, and it is accompanied by a bad smell.3. Caused by endometrial cancer, patients with endometrial cancer are often manifested as Vaginal discharge is like slurry, that is, the same as watery discharge. If it is in advanced stage, combined with infection, it will cause bad odor.4. Tubal cancer, there will be a large amount of watery secretion and accompanied by lower abdominal mass, but this watery secretion has no bad odor.