Hello,
You did nt mention you age, however i am assuming that you young.
The possibilities are
1.Cervicitis - Infection and inflammation of the cervix, can be caused by bacterial vaginosis, chlamidya infections etc
2.Cervical Polyps
3.Minor trauma (unnoticed) during intercourse
4.Cervical ectasia ( a kind of erosion of the cervix surface)
5.Rare causes - a tumor, missed abortion.
You will need an evaluation by an Obgyian if symptoms are persisting. Make sure you are using barrier contraception (condoms)
Thank you for asking online doctor at www.doctorspring.com