The causes of heavy odor down there include gynecological inflammation, gynecological tumors and poor hygiene habits. 1. Gynecological inflammation. For example, in the case of trichomoniasis, the odor appears due to the anaerobic fermentation of carbohydrates by trichomonas, which produces putrid gas. In bacterial vaginosis, amines produced by anaerobic bacteria can also produce a fishy odor. In mixed vaginitis, severe odor may also occur. Early gynecological consultation for vaginal microecological examination is required for evaluation. 2. Gynecological tumor. For example, in cervical cancer, most patients will have the symptom of fishy-smelling vaginal discharge, and advanced patients may also have purulent foul-smelling discharge. Submucous membrane leiomyoma protruding outside the cervical opening may also have the symptom of foul-smelling discharge due to long-term chronic stimulation. 3. Poor hygiene habits, such as untimely change of clothing, sweating or wearing tight-fitting chemical fiber clothing, etc., may also appear in the lower body odor. If the odor is not relieved after improving hygiene habits, you need to consult a doctor.