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Welcome to Chat Doctor Good Trigger point injection as a relatively safe and effective way to ease pain from muscle spasm. The herniated disc irritates nerves that send your muscles into spasm. The trigger point is located by your Doctor and the area is cleaned with antiseptic over the skin. Using a small needle a local anesthetic and/or corticosteroid is injected. Relief can be expected from immediate effect. Side effects may include nerve damage, bleeding, infection which can be prevented by proper procedure and aseptic technique. It is indicated only to relieve pain due to muscle spasm, but as the disc herniation increases there could be more pain and spasm, but the procedure is relatively safer than Epidural.