Botox® injections are providing pain specialists with a new modality for treatment of chronic pain associated with headaches, neck and shoulder pain. The injections work by triggering chemical denervation at nerve endings and thereby blocking nerve pain for chronic pain sufferers that have not responded to other treatment modalities. Pain relief often lasts for 3-4 months and the onset of relief typically begins one week following treatment. Botox® injections are typically implicated for treatment of muscle pain arising from chronic muscle spasm, headaches, neck pain and myofascial pain.