A pain management physician may use a variety of different injections in the course of your treatment. Injection therapy is both therapeutic and diagnostic.
Injections play a diagnostic role in that the physician will observe how your pain symptoms respond to a specific injection. Even if the injection fails to relieve pain, the injection process will provide more information back to the pain specialist that may lead the physician to a type of injection, or a treatment recommendation, that does work for you.
Injections play a therapeutic role in that they can relieve pain symptoms either permanently, or at least long enough for you to progress into a therapy program that then strengthens muscles and ligaments so they are resistant to a recurrence of pain.