If there is blood on the 3rd day after each intercourse, the main consideration is the presence of cervical lesions. The main cervical lesions that cause contact bleeding are cervicitis, including cervical polyps, cervical erosion, and in severe cases, cervical cancer. Both cervical polyps and cervical erosion can lead to a bad and brittle surface of the cervix, which can easily lead to contact bleeding. Currently cervical erosion is not pathologically a true erosion and can be a physiological erosion. The most serious case is cervical cancer, which is characterized by the presence of cancerous lesions that make the surface of the cervix very brittle, and the most typical symptom is contact bleeding. The most typical symptom is contact bleeding. Patients with the above conditions can go to the hospital for gynecological examination and, if necessary, biopsy for pathology.