If the vaginal discharge is very smelly, it is clinically caused by the following reasons: 1. It is the most common bacterial vaginosis. When dysbiosis in the vagina causes anaerobic bacterial infection, it leads to bacterial vaginosis, which is clinically manifested by thin and abundant leucorrhea with a great fishy odor. Clinically, it can be diagnosed by routine laboratory tests of the leukorrhea. It is recommended to use metronidazole or tinidazole suppositories and insert them into the vagina for treatment.2. Clinically, if there is an odor in the discharge, it is also seen in cervical cancer and endometrial cancer. It is recommended to do screening for cervical cancer and ultrasound examination to understand the condition of endometrium. If there is abnormal thickening of the endometrium, or uneven echogenicity, or abnormal masses, it is recommended to do diagnostic scraping and clinical diagnosis according to pathology, and then give appropriate treatment.