Normal female leukorrhea has a slightly fishy odor but does not emit a foul smell. Leukorrhea odor is usually caused by lesions in the reproductive system. For example, trichomoniasis or bacterial vaginitis, cervical erosion, severe uterine infections, vaginal cancer, cervical cancer, etc. can cause the phenomenon of smelly leukorrhea. The leukorrhea is a kind of secretion from the vagina, which normally moisturizes and cleanses the vagina, but if the vagina is infected by some pathogenic bacteria, causing trichomoniasis or bacterial vaginitis, the leukorrhea will emit a special odor, for example, the leukorrhea will emit a fishy odor after a bacterial vaginitis attack. If there is cervical erosion, the erosion surface will produce purulent leucorrhea with a foul odor. In severe cases of cervical infection, pus-like discharge may occur in the uterine cavity and may be expelled through the vagina with medication or uterine contractions, during which the foul odor is clearly detectable. Vaginal cancer and cervical cancer, as the disease progresses, will not only have a strong foul odor in the later stages, but also some flesh-like tissue will be discharged from the body. Therefore, women should pay attention to the phenomenon of foul-smelling leukorrhea and go to the hospital for a reproductive system examination to identify the cause of the disease and get timely treatment.