Inclusion Criteria:  18 years of age or older Candidate is undergoing Medtronic SCS device trial for chronic, intractable pain of the trunk and/or limbs If being treated for low-back and leg pain - baseline Visual Analog Scale is ≥ 60 mm for low-back and leg If being treated for upper limb pain - baseline Visual Analog Scale is ≥ 60 mm for upper limb pain On stable (no change in dose, route, or frequency) prescribed pain medications being used for back and leg pain or upper limb pain, as determined by the investigator, for at least 28 days prior to device trial Willing and able to provide signed and dated informed consent Willing and able to comply with all study procedures and visits  Exclusion Criteria:  Indicated for an SCS device to treat stable intractable Angina Pectoris or Peripheral Vascular Disease of Fontaine Stage III or higher Previously trialed or implanted with spinal cord stimulator, peripheral or vagus nerve stimulator, deep brain stimulator or an implantable intrathecal drug delivery system Currently participating, or plans to participate, in another investigational study unless written approval is provided by the Medtronic study team Major psychiatric comorbidity or other progressive diseases that may confound study results, as determined by the Investigator Serious drug-related behavioral issues (e.g. alcohol dependency, illegal substance abuse), as determined by the Investigator Pregnant or planning on becoming pregnant (if female and sexually active, subject must be using a reliable form of birth control, be surgically sterile, or be at least 2 years post-menopausal) Be involved in an injury claim or under current litigation