The Culture and Sensitivity - Vaginal Swab is often performed to detect the pathogen that is currently causing you to experience vaginal irritation and discharge. Vaginal discharge is a painful condition, one that can cause you to experience various symptoms ranging from – Sharp pain when urinating Blood in urine Swelling of the vagina Vaginal discharge Redness around the vagina Burning sensation in and around your vagina If any of these sound familiar, then you need to consult with your physician right away as this can often be an indication of a more serious health issue.