The phenomenon of a very smelly lower body without changing underwear for a day may be caused by the lack of good cleaning. If you do not pay attention to the cleanliness of the excretory organs in daily life, and do not use tissues to wipe clean the excretory organs after defecation and urination, it may lead to the residue of excrement on the skin surface, which results in a very smelly situation underneath without changing underwear for a day. In addition, if female patients have cervicitis, pelvic inflammatory disease, endometritis and other uterine diseases, or there is trichomoniasis, vulvovaginal pseudomonal yeast disease and other vaginal inflammatory diseases; male patients have circumcision, glansitis and other diseases, may lead to a day without changing underwear underneath is very smelly. A female patient: 1, uterine disease: such as cervicitis, pelvic inflammatory disease, endometritis and other inflammatory diseases, as well as cervical cancer, precancerous lesions of the cervix, endometrial polyps, uterine fibroids and other uterine masses, may lead to abnormal secretions, manifested as a day without changing underwear below the stink. Patients who suspect the presence of uterine diseases can visit the clinic for routine gynecological duplex examination, thin layer liquid-based cell test, HPV, ultrasound, and vaginal cleanliness or microecological examination. If there are abnormalities in the thin layer liquid-based cell test and HPV examination, further colposcopy and pathological biopsy should be done according to the situation to exclude cervical cancer and precancerous lesions. If it is just common uterine inflammation, patients can use antibiotic drugs such as cefaclor and amoxicillin under doctor’s guidance for anti-infection treatment; if there is malignant tumor of uterus, the lesion needs to be removed by surgery in time; endometrial polyp, uterine fibroid, etc. need to choose observation or surgery according to the specific situation of the swelling; 2. Vaginal inflammation: commonly includes vulvovaginal pseudomonal yeast disease, trichomonas vaginalis, bacterial vaginitis, etc. This is usually caused by the disturbance of the normal flora in the vagina. Patients will have abnormal leucorrhoea and odor of the leucorrhoea, which can be manifested as a stench underneath the patient’s underwear without changing for a day. If patients suspect vaginal inflammation, they can be judged by routine leucorrhea and micro-ecological results, and can be treated with metronidazole, fluconazole and other drugs as prescribed by the doctor. The main reason is that the foreskin is too long, so the foreskin cannot be turned up for cleaning or daily cleaning is not in place, and the foreskin cavity between the glans and the inner plate of the foreskin is filled with excrement such as skin shedding dirt or urine stains and forms foreskin scale, which may lead to a day of not changing underwear underneath a very smelly situation. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. A day without changing underwear is very smelly underneath. Patients can follow medical advice to use itraconazole, metronidazole and other drugs to treat. If there are other uncomfortable symptoms, it is recommended to seek medical examination in a timely manner, according to the results of the examination to clarify the cause of the disease before symptomatic treatment, after treatment should be regularly reviewed to prevent recurrent attacks. In daily life, patients need to pay attention to lower body hygiene, wash the vulva regularly, wear breathable cotton underwear, and change it daily.