Dorsal medial branch blocks are minimally invasive injections that disrupt pain impulses from reaching the brain. These are considered diagnostic nerve blocks, as they can determine the source of pain. Some patients experience temporary pain relief while other times relief is more long-lasting. Medial branch nerves are located near facet joints and are responsible for small muscles in the cervical, thoracic, and lumbar region. Therefore, medial branch blocks can diagnose or treat neck, mid back, and low back pain.