The objective of the study is to assess the short-term and long-term effects of transcutaneous pulsed radio frequency treatment on the physiological status, subjective well-being, and on the intensity of pain. Category A Transcutaneous Pulsed Radiofrequency is a method that is widely used for control of pain. There are no known complications. In this study a Radiofrequency generator will be used that has a separate outlet for transcutaneous use. Patients will be recruited within the clinic population of patients.

Data will be assessed in at three times, the baseline testing, the first and the second follow-up meeting (+2-4 days of intervention; as well as + 40 days via post/email)

The inclusion criteria are: Inclusion:

• age 18 - 65
• chronic pain (Duration of three Months or more) patients of the Pain Center Nottwil, Swiss Paraplegic Center

The following criteria will lead to an exclusion of the study:

• severe medical issues, such as cancer or comparable diseases
• severe mental disorders such as severe depression or schizophrenia
• patients with pacemakers or with atrial fibrillation
• Women who are pregnant or breast-feeding The primary outcome assessed is the physiological status, assessed by the heart rate variability (HRV). Secondary outcomes are the subjective well-being, as assessed by the "Marburger questionnaire regarding habitual well-being" (FW-7) questionnaire as well as the intensity of pain, as assessed by the numeric rating scale for pain intensity (NRS) score and by a 7-point Likert scale.

Inclusion Criteria:

• age 18 - 65
• chronic pain (Duration of three Months or more) patients of the Pain Center, Swiss Paraplegic Center, Nottwil

Exclusion Criteria:

• severe medical issues, such as cancer or comparable diseases
• severe mental disorders such as severe depression or schizophrenia
• patients with pacemakers or with atrial fibrillation
• Women who are pregnant or breast-feeding