What are nerve blocks?

Injections.: Nerve, spinal nerve roots, and medial branch blocks (for facet joints) are injections done using a local anesthetic to determine if a specific nerve, specific spinal nerve root, or facet nerve is the source of pain. Blocks also can be used to reduce inflammation and pain when used with a steroid.

Injections : Injections of local anesthetics around the nerve.

Nerve block: Nerve blocks are a generic term usually to mean NUMBING a particular nerve (or nerve root in or as it leaves the spine) to both test a source of a problem (like pain, numbness, tingling, etc), and possibly also treat that problem.