There are more reasons for the fishy odor in the lower body, which may be caused by bacterial vaginosis, cervicitis, cervical cancer and other diseases. 1. Bacterial vaginosis: Bacterial vaginosis is an inflammation of the vagina caused by a variety of pathogenic bacteria, patients may have increased vaginal discharge, thin, secretions are often accompanied by fishy odor, manifested as a fishy odor in the lower body. 2. Cervicitis: Infection by pathogens such as Neisseria gonorrhea, Chlamydia trachomatis and herpes simplex virus may induce cervicitis. It manifests as increased leukorrhea secretion, accompanied by peculiar smell, vulvar itching, burning, etc., and the symptom of fishy smell in the lower body. 3. Cervical cancer: Human papilloma virus infection is the most important factor in the development of cervical cancer, and the patient will have white, bloody and other abnormal fluids discharged from the vagina, and when accompanied by infections, the vaginal discharge will have a fishy or foul smell, resulting in a fishy odor in the lower body. There are many reasons for the fishy odor of the lower body, it is recommended that patients go to a regular hospital, under the guidance of the doctor to carry out relevant examinations, to clarify the cause of the disease and then actively targeted treatment.