The leucorrhea is formed by a mixture of vaginal mucosal exudate, cervical glandular secretions and endometrial glandular secretions. The normal leucorrhea is clear or white in color and has a thin texture. When the leucorrhea smells bad, inflammatory lesions in the reproductive tract should be considered, which are mostly seen in septic infections, cervical lesions and vaginitis, and need to be analyzed according to the cause: 1. Septic infections: women’s leucorrhea with odor is considered to be caused by septic infections of the genitourinary system, such as gonorrhea, mycoplasma and chlamydia. This type of disease is sexually transmitted diseases, mainly manifested as increased vaginal discharge, while purulent with odor; 2, cervical lesions: reproductive tract diseases caused by the odor of the leucorrhea, such as women suffering from cervicitis, endometritis, cervical cancer or endometrial cancer and other diseases, can appear leucorrhea very smelly. The leukorrhea of such patients often emits a foul odor, is rice slop-like, and also has contact bleeding; 3. Vaginitis: Trichomonas vaginalis is a common vaginal disease and is prone to attack before and after women’s periods. It is manifested by increased vaginal discharge, and itching, burning and painful sensation in the vulva. The discharge is purulent, grayish yellow, grayish white or yellowish green, and the leucorrhea is foamy and has a putrid odor. The foul smell of leukorrhea may also be caused by bacterial vaginitis, because the vaginal flora is dysbiosis, anaerobic bacteria produce amines, which in turn give off a fishy smell, especially after sexual intercourse can be aggravated, leukorrhea will be significantly increased, grayish white, thin; 4. Other diseases: such as vestibular gland abscess, after the abscess breaks, there will also be leukorrhea with foul smell symptoms. At this time, the pus should be removed and treated with anti-inflammatory medication.