There are many possible causes of yellow watery leucorrhea, including trichomoniasis, pelvic inflammatory disease and uterine malignancy. Common causes and treatments 1. Trichomonas vaginitis: yellow watery leucorrhea with foamy discharge, occasional diarrhea, abdominal pain, etc. It is recommended to go to the hospital for vaginal secretion examination to confirm the diagnosis. Under the guidance of the doctor, oral metronidazole and tinidazole can be taken, and clotrimazole can be inserted into the vagina. The vaginal discharge smear and posterior vault aspiration should be done in time, and the urethral discharge of the male partner should be examined to assist in the diagnosis. Treatment can be prescribed by using broad-spectrum antibiotics and combined with anti-anaerobic drugs, such as cephalosporins plus metronidazole, etc. Pay attention to the adequate course of treatment. 3. Malignant tumors of uterus: endometrial cancer and cervical cancer may also show yellow watery leucorrhea, bloody or plasma discharge, and if there is co-infection, there will be pus and blood fluid with bad odor. They should go to the hospital for ultrasound examination, pelvic MRI examination, segmental scraping, etc. After confirmed by the doctor, surgery, chemotherapy, radiotherapy, etc. should be feasible, while patients should be encouraged to actively treat and keep a good attitude. It is recommended to use water or common soap to clean the vulva daily, and increase the frequency of cleaning during menstruation. Avoid using gel, antibacterial lotion or vaginal douche, which may lead to ecological imbalance of vaginal flora and cause inflammation or allergic reaction.