There are several reasons why the leukorrhea is smelly: 1. Vaginitis: Most of them are caused by vaginitis, most likely caused by bacterial vaginitis, but of course mycotic vaginitis and trichomoniasis may also show symptoms of leukorrhea odor. 2. Infection: If women have mycoplasma or chlamydia or gonococcal infection, they may also show the phenomenon of leukorrhea odor and smelly. 3. Malignant tumor: If women are older, especially over 40 years old, they may also have cervical cancer or endometrial cancer, which are malignant tumor diseases. If a woman is older than 40 years old, especially 50-60 years old, she may have cervical cancer or endometrial cancer, which are malignant tumor diseases. This is usually diagnosed through cervical cancer screening, or colposcopic pathological biopsy or scraping, and confirmed through pathological reports. 4. Pus accumulation in the uterine cavity: If older women have been menopausal for many years and have foul-smelling leukorrhea, it may also be caused by pus accumulation in the uterine cavity.