Spinal injections can help treat radiculopathy, the inflammation or damage to a nerve in the neck or lower back, and spinal stenosis, the gradual narrowing of the spinal canal.
Doctors also use injections for other types of back pain. Sometimes, they also use them to help find out what's causing the pain generation. These are called diagnostic blocks.
If the initial injection is effective for a patient with back pain, he or she may have up to three injections spaced two weeks apart in a 6 -12 month period. But it is up to your doctor to determine the frequency of such injections upon determining the right course of treatment, side effects from the medication used and any long-term impact of back injections on overall health.