A little bleeding after coitus may be caused by cervical inflammation, cervical cancer, uterine submucous fibroid and other reasons. 1. Cervical inflammation: such as cervical polyps, due to the brittle polyp tissue, easy to contact bleeding, can cause a small amount of vaginal bleeding after intercourse, can be diagnosed through gynecological examination, ultrasound and other assistance. 2. Cervical cancer: it can also cause small amount of contact vaginal bleeding after coitus, which is recurrent and may be accompanied by rice-water-like vaginal discharge. Combining with clinical manifestations and cervical cytology, colposcopy and cervical biopsy can assist in the diagnosis. 3. Uterine submucous fibroid: when the fibroid is detached from the cervix to the vagina, it will also lead to contact vaginal bleeding after coitus, which can be diagnosed by gynecological examination and ultrasound. When there is a little bit of bleeding after intercourse, you can go to the hospital to find out the cause and deal with it actively.