The yellowish color on a woman’s underwear usually refers to secretions staining the underwear and appearing yellow in color, and there are many reasons for this, such as vaginitis, endometritis, and urine residue. 1. Vaginitis: It can be caused by bacterial, fungal and other infections that lead to vaginal inflammation, causing an increase in vaginal secretions and abnormal secretions sticking to the panties. 2. Endometritis: endometritis can be caused by bacteria and other retrograde infections, leading to an increase in leukorrhea and a change in the leukorrhea’s character, resulting in the phenomenon of yellow discharge on the underwear. 3. Urine residue: some women do not wipe their private parts in time after urinating, which may lead to urine staining on the panties and mixing with vaginal secretions, thus leading to the phenomenon of yellow discharge on the panties. There are many other reasons that can lead to the phenomenon of yellow discharge on the panties of women, it is recommended that such patients to go to a regular hospital to clarify the cause, and actively seek treatment.