The most common factor is vaginitis. It is recommended to have a white belt examination to find out what the causative agent is and use different treatment options depending on the causative agent. If it is trichomonas infection, you can use metronidazole, if it is mycobacterial infection, you should use antifungal drugs, and bacterial vaginosis can also be treated with metronidazole. In case of mycoplasma-chlamydia infection, tetracycline or azithromycin or doxycycline are used for treatment. Second, malignant tumors of internal reproductive organs, such as cervical cancer, endometrial cancer or fallopian tube cancer, may occur, and the discharged fluid will have a foul odor. It is recommended to go to the hospital for further gynecological examination to clarify the diagnosis.