The mucous membrane at the entrance to the vagina is torn and bleeding due to external force. It is a severe trauma to the soft tissues between the anus and external genitalia that causes a visible tear in the perineum by localized puffing and thinning, and can be severe enough to tear into the anus. So, what are the causes of vaginal entrance mucosal tears? The following are the causes of vaginal entrance mucosal tear: 1. The vaginal entrance mucosal tear is easily caused when the mucosal membrane is not fully expanded during the first time of intercourse or when the intercourse is too rapid or too violent. This condition is more common in young girls who have had forbidden fruit. Generally speaking, women’s vaginas are flexible and have many longitudinal and transverse folds, which make it easy to expand without tearing. The vagina of teenage girls is not yet well developed and the first time they have intercourse they are too tense and their muscles contract, making them prone to tearing with more force. 2. In older women, the vagina shrinks and vaginal secretions decrease, which can cause tearing during intercourse. 3.Some women put their hands or other hard foreign objects into the vagina during masturbation, resulting in vaginal rupture. If the labor progresses too fast, the birth canal is not sufficiently dilated and the fetus is large, the mucous membrane at the entrance of the vagina will tear easily.