An Epidural Steroid Injection (ESI) is a minimally invasive procedure that can assist with relieving your neck, arm, back, or leg pain that is caused by inflamed spinal nerves. An ESI can also be used to provide pain relief from spinal stenosis, spondylolysis, or disc herniations. A local anesthetic will be used and delivered with a very small needle, so you may feel a little pinch followed by a slight, temporary burning sensation. Once the numbing agent takes effect, any discomfort from the actual steroid injection should be minimal, and will likely just feel like slight pressure, and the actual procedure generally takes less than twenty minutes to perform. You should allow an hour for the appointment, which gives you time to fill out the necessary paperwork, speak with your doctor before the procedure, and allow observation after the injection is completed. It will usually take a couple days or even up to a week the steroid to take effect, but as these anti-inflammatory injections are meant to be long-lasting, the pain relief can last anywhere from many days to several months, and vary by patient.