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New Onset Tinnitus after High-Frequency Spinal Cord Stimulator Implantation. The most common complications of spinal cord stimulation (SCS) therapy are generally related to surgical site infection and hardware malfunction. Less well understood are the adverse neurological effects of this therapy. We present the case of a patient who underwent placement of a Senza HF10 high-frequency spinal cord stimulator with subsequent development of tinnitus, vertigo, intermittent involuntary left facial twitches, and perioral numbness. These symptoms resolved following deactivation of her device. To further explore these less common neurologic complications of SCS therapy, a review of literature and a review of the U.S. Food and Drug Administration Manufacturer and User Facility Device Experience database are included. Further research and investigation in this area are needed so that clinicians and patients may have more complete knowledge and understanding of the potential treatment-limiting complications of spinal cord stimulation.