The most common reason for yellowish leucorrhea with blood after intercourse is the presence of acute gynecological inflammation. Normal leucorrhea is a mixture of uterine cervical glandular secretions, as well as vaginal epithelial exfoliated cells and other components, which are milky mucus. If gynecological inflammation is evident, the leucorrhea is mixed with more inflammatory cells and inflammatory necrotic tissue in it, which will lead to abnormal color of leucorrhea, which may be yellow or green. Inflammation may cause the vaginal mucosa, the endocervical lining, and the endometrium to be congested, edematous, and the tissue is fragile. Sexual contact and friction will easily cause mucosal damage resulting in bleeding, and if the bleeding is small and mixed into the leucorrhea, it will result in leucorrhea with blood. Gynecological inflammation causing abnormal color of leucorrhea and bleeding from sex is not normal, you need to go to the gynecology department combined with vaginal examination, leucorrhea laboratory test results, actively take antibacterial and anti-inflammatory treatment, temporarily can not have sex to prevent aggravation of the disease.