The yellowing of underwear with odor may be due to physiological or pathological reasons, such as incomplete cleaning of underwear or long-term sun exposure, or may be caused by gynecological diseases such as vaginal inflammation in female patients and glansitis in male patients. A, physiological reasons 1, underwear cleaning is not clean: If you do not change underwear for a long time or clean, may also cause yellow underwear with odor; 2, long-term exposure to the sun and rain: when underwear for a long time in the outdoor without timely collection, may be in the rain and sunlight, so that the underwear become yellow and odor. The endometritis of old age is mostly purulent leucorrhea, and often contains a small amount of blood. When the uterus accumulates pus, the discharge will be purulent with odor, so it will also lead to yellow panties with odor; 3, trichomonas vaginitis: clinical manifestations are often vulvar itching, burning pain or painful intercourse, the discharge is often characterized by thin purulent, foamy, yellow-green, odor, etc.; if you change your panties diligently but still have yellow panties with odor, and accompanied by vulvar itching and other uncomfortable symptoms, it is recommended to go to the hospital for examination to clarify The actual fact is that you can find out what kind of disease is causing it, and then treat it symptomatically; 4, glansitis: If a man has yellow underwear with odor, do not exclude the possibility of glansitis. The actual fact is that you can find a lot of people who are not able to get a good deal on this kind of things.