The first step of the thoracic injection treatment is applying a local anesthetic to the treatment area. This helps to relieve any discomfort that may occur during the injection process. Once the skin is numbed, a needle will be carefully inserted into the epidural area of the thoracic region. After the needle is in place, the injection will be performed. This treatment is typically completed in less than an hour. After treatment, you may notice some minor swelling or bruising at the injection site, but these effects usually fade within a few days.