We successfully performed cervical spinal cord stimulator (SCS) surgery in a 27-year-old man with complex regional pain syndrome to control intractable pain. The SCS trial was performed twice to adjust the SCS coverage region. After permanent implantation surgery, the patient developed Horner's syndrome when the region near the C4 spinal dorsal root was stimulated. However, Horner's syndrome disappeared after changing the stimulation leads. This case report suggests that cervical SCS can be associated with superior cervical ganglion stimulation.