If the leukorrhea is yellow and purulent, it is mostly due to the following reasons: 1. Chronic cervical inflammation is the main reason for the leukorrhea to be yellow and purulent. The patient may also manifest as lower abdominal swelling, lumbosacral pain after intercourse, or contact bleeding after sex.2, bacterial vaginosis. This is also a common cause of abnormal purulent leukorrhea, bacterial vaginosis leukorrhea thin, purulent yellowish color, and there will be a special odor.3, uterine cavity pus. If there is a more serious endometrial inflammation in the acute stage, it will also be manifested as leukorrhea purulent, yellowish in color, and the patient often has a history of uterine operation, such as abortion surgery, uterine cleaning surgery, tubal iodine oil imaging, etc., which manifests itself as symptoms such as high fever, lower abdominal distension and pain, irregular vaginal bleeding, and leukorrhea with purulent leukorrhea.