Normally, a normal and coordinated sexual life does not cause vaginal bleeding in the woman. Bleeding after intercourse may indicate some pathological condition that needs to be taken seriously. With the spread of medical knowledge, most women are able to seek timely medical attention, but the shortcoming is that they lack knowledge about the cause of vaginal bleeding and mistakenly believe that they have cancer. Unbeknownst to them, vaginal bleeding is a common manifestation of many gynecological diseases. The common causes are: 1) Damage (1) Hymen rupture The hymen rupture is common during the first sexual intercourse. This kind of bleeding usually occurs during sexual intercourse and can stop on its own in 1-2 hours, which may be accompanied by pain. The amount of bleeding is related to the location and degree of injury. (2) Vaginal injury For bleeding during or after sexual intercourse, the possibility of vaginal laceration should be thought of if the bleeding is heavy and prolonged. Vaginal laceration mostly occurs during involuntary sexual intercourse or very rough sexual intercourse, and can also be seen in some vaginal abnormalities. Inflammatory diseases of the reproductive tract, such as cervicitis, vaginitis, and endometritis, are the most common causes of post-coital vaginal bleeding. Common vaginitis are mycosis vaginalis, trichomonas vaginalis, senile vaginitis. Generally, vaginitis has symptoms of vulvar itching and increased leucorrhea, and in severe cases, vaginal mucosa is edematous, congested or broken. In severe cases, the vaginal mucosa may be edematous, congested or ruptured. During sexual intercourse, vaginal irritation may lead to bloody discharge and a burning sensation in the vagina. Cervical erosion or cervical polyps are more common in women of childbearing age. Cervical erosion is actually due to chronic inflammation for a long time, the original squamous epithelium on the surface of the cervix is shed and covered by the columnar epithelial proliferation in the cervical canal, which has a red granular appearance. Its does not lead to cancer, and mild cervical polyps do not lead to the occurrence of post-coital bleeding. Cervical polyps consist of mucosal glandular epithelium wrapped around a vascular axis and covered wholly or partially by squamous epithelial cells. Most cervical polyps are asymptomatic, some manifest as intermenstrual bleeding or spotting after intercourse. If you feel no abnormalities in the vulva and leucorrhea, but repeatedly have a small amount of bleeding after intercourse, especially during intercourse with discharge, there is the possibility of severe cervical erosion or larger and more cervical polyps. You should consult a doctor as soon as possible for cervical cancer screening to find out whether there is a combination of HPV infection and other conditions. If HPV infection is present, further TCT and colposcopy should be performed as needed. Bleeding after sexual intercourse is often one of the danger signs of cervical cancer, which is also the reason why many women talk about blood. The bleeding of cervical cancer is often small, bright red or with blood in the leukorrhea. As the cervical tissue becomes brittle and fragile, it will break down and cause bleeding when the cervix is directly hit. Most cervical cancer patients do not have any uncomfortable symptoms in early stage, and bleeding after sexual intercourse may be the only symptom of early cervical cancer. 4.Other In addition, submucosal myoma of cervix, dislocation of intrauterine device, premature start of sexual life during menstruation, after abortion and puerperium, which may cause infection, are also the reasons of post-coital bleeding. In short, where there is bleeding during intercourse, you should go to the hospital to do a comprehensive examination to exclude the above-mentioned diseases. More attention, more health.