If the leucorrhea is yellow but not painful, it is common for the following clinical reasons. 1, local inflammation of the vagina, mainly caused by miscellaneous bacterial infection, will appear yellow leucorrhea. 2, local inflammation of the cervix, when the local inflammation of the cervix, glandular secretion will lead to yellow leucorrhea and relatively thick. 3, inflammation of the pelvis, when there is inflammation of the pelvis will lead to a large amount of exudation, will also make the leucorrhea yellow. The yellowing of the leucorrhea is accompanied by repeated pain in the lower abdomen, which is often aggravated during menstruation, sex or after exertion, so go to the hospital as soon as possible when the leucorrhea appears yellow. In addition to routine tests of the leukorrhea, it is also important to find out whether there are local abnormalities in the cervix. If necessary, screening for cervical cancer is recommended, and the possibility of inflammation in the pelvis should also be ruled out.