Patient has an understanding of the study and its procedures, agrees to its provisions, and gives written informed consent prior to any study-related procedures
Patient is suffering from one of the following chronic pain conditions originating from myofascial pain:
* low back pain
* tension headache
* neck pain
having been persisting for a minimum of 3 months and where myofascial pain syndrome is the pre-dominant cause for pain.
Patient is constant with respect to pain treatment for 1 week during the screening phase
A daily average NRS \>= 4 on 4 out of 7 days in the screening phase
Compliance with the daily status reporting requirements as demonstrated
You may not be if
Patients with active implants
Allergy against rescue medication used during the study
Pregnancy
Mental or physical impairments that represent a source of risk for handling the device
Patients with cerebral spams (epilepsy)
Patients with psychiatric diseases or somatoform pain disorders
Patients with oral morphine equivalent of more than 120mg daily dose
Patients taking centrally acting muscle relaxants like Sirdalud or benzodiacepines
Patients with a contraindication against NSAID's
Presence of artificial joints made from methylmethacrylate or polyethylene at stimulation site
Presence of ferromagnetic metal implants at stimulation site, especially aneurysm clips, dental implants, etc.
