Pain in the vagina during intercourse is caused by the following reasons: 1. Inflammation in the vagina. When there is inflammation, the mucosal tissue becomes congested and edematous. Clinically, anti-inflammatory treatment should be actively given to improve the symptoms of vaginal pain during intercourse. 2. If a woman of childbearing age has a decrease in vaginal discharge, it may be caused by premature ovarian failure and should be actively examined and treated according to the results.