Panty odor is mainly caused by the following reasons: 1, may be more vaginal secretions, urine residue and other reasons, when vaginal secretions and urine residue in the panties, will lead to local bacterial growth and thus triggering the odor, but also because of the usual do not pay attention to personal hygiene, panty replacement is not timely and other reasons. 2, may be the inflammatory reaction caused by vaginitis, cervicitis, pelvic inflammatory disease. Inflammatory diseases, when the inflammation stimulation will lead to the increase of vaginal secretion, thus appearing vaginal odor and other symptoms. 3, there may be endocrine disorders or other malignant tumors caused by diseases, such as cervical cancer, endometrial cancer and other diseases. When there is a bad smell, and the vaginal secretion increases, accompanied by other abnormal symptoms, it is best to go to the hospital in time for examination, and do the corresponding cancer prevention work.