The particularly bad smell down there in late pregnancy may be caused by cervicitis, trichomonas vaginitis, candida vaginosis and other diseases. 1. Cervicitis: the occurrence of this disease is related to the cervix being infected by Neisseria gonorrhea, Chlamydia trachomatis, Mycoplasma genitalium and other pathogenic bacteria. Secondly, it also includes vaginal flora imbalance and hormone level imbalance. Symptomatic patients will have abnormal vaginal bleeding, lower back and abdominal pain and other symptoms, and some patients will also have an increase in leukorrhea discharge, accompanied by the symptom of odor. 2. Trichomonas vaginitis: this disease is mainly caused by Trichomonas vaginalis infection, which can be indirectly transmitted through sexual intercourse or contaminated items such as public baths and bath towels. Common symptoms include itching of the vaginal opening, increased vaginal discharge, accompanied by a putrid odor. Therefore, the particularly unpleasant smell down there in late pregnancy may be caused by trichomonas vaginitis. 3. Candida vaginosis: the causative organism of this disease is Pseudomonas albicans, followed by Pseudomonas smoothii and Pseudomonas tropicalis. It can also be transmitted through endogenous, sexual intercourse, etc. Patients will experience symptoms such as vulvar itching, redness, swelling, pain, etc. A few patients will experience the phenomenon of odor in the private parts. In clinical practice, it is recommended that patients with particularly unpleasant odor in the lower part of the body during late pregnancy should go to the hospital in time in order to clarify the specific cause.