Fishy odor and watery flow out of the underwear, the common clinical causes of trichomonas vaginitis, bacterial vaginitis, mycosis fungoides and so on. 1. Trichomonas vaginitis: this disease refers to vaginal inflammation caused by Trichomonas vaginalis infection, which is mainly transmitted through sexual intercourse, clinical manifestations include vulvar itching, foamy yellowish-white thin secretion, etc., accompanied by frequent urination, urinary urgency, painful urination and other symptoms. 2. Bacterial vaginitis: this disease refers to a mixed infection caused by the imbalance of normal flora in the vagina, which is one of the most common causes of vaginitis in women of childbearing age, with typical clinical manifestations such as increase in vaginal secretions, thin vaginal secretions accompanied by a fishy odor, and so on. 3. Mycotic vaginitis: this disease refers to the inflammation of the vulva and vagina caused by Pseudomonas aeruginosa, the clinical manifestations of vulvar itching, leukorrhea, and so on, the sick women will also be accompanied by painful urination, itching symptoms of episodes of instability, etc., the physical and mental health of women will cause serious impact. The above symptoms may also be caused by other factors, if the symptoms persist or tend to worsen, it is recommended to go to a regular hospital as soon as possible for consultation and treatment, in order to strive for early recovery.