An Epidural Steroid Injection is a minimally invasive procedure used to treat radicular pain caused by conditions like sciatica and herniated discs. The injection delivers a corticosteroid and a local anesthetic into the epidural space of the spine to reduce inflammation and provide rapid pain relief. While there are risks, such as infection or temporary pain, the goal is to improve function and quality of life, with most patients resuming normal activities within 24 hours.