The goal of this interventional study is to test effects of spinal cord stimulation in patients receiving treatment for their chronic pain. The main question of the study is:

• What is the effect of spinal cord stimulation when compared to placebo? Participants will rate their pain with their usual spinal cord stimulation on and off.

Inclusion Criteria:

• Patients (>18 years of age) with SCS implanted to treat chronic pain.
• Patients who consent to participation and can cooperate in the study.
• Use of continuous paresthesia-free SCS for minimum 6 months prior to participation in the study.
• Pain score of 7 or less on a 0-10 scale in the most painful area treated with SCS, rated upon inclusion.
• Patients not receiving other neuromodulation treatment.
• Patients who have not undergone changes in their (pain relevant) medication during the last 30 days (pro necessitate medication allowed).