A few days before menstruation, there is usually not a small amount of blood on the cervix. If a woman has cervical bleeding, it is considered to be caused by cervical polyps, cervicitis and cervical cancer. 1. Cervical polyps: Clinical manifestations are menstrual dribbling, bleeding after sexual intercourse or bleeding between menstrual periods, etc. The cause may be chronic inflammation, cervical infection and other factors. 2. Cervicitis: usually manifested as increased vaginal discharge, bleeding after sexual intercourse, pain, etc. Cervicitis is mainly related to pathogen infection, vaginal flora disorders and hormonal imbalance and other factors. 3. Cervical cancer: its causes are mostly related to HPV persistent infection, and factors such as low immune function, many sexual partners and smoking may also induce the disease. Patients will have symptoms such as contact bleeding, abnormal vaginal bleeding and fluid discharge. There is no relationship between coitus and cervical bleeding a few days before menstruation. If you have this phenomenon, it is recommended that you go to a regular hospital to clarify the cause.