Inclusion Criteria:  age between 18 and 80 years clinical diagnosis of chronic LBP (low back pain) and or neck pain average resting pain-level > than 3 in the Numeric Rating Scale (0-10) no changes in pain medication 4 weeks at baseline no surgical procedures in the last 2 years  Exclusion Criteria:  metallic and electronic implants in the head, neck and chest medication e.g. tetracyclic antidepressants, antiviral, antipsychotic, opioid doses > 100mg orally/d history of frequent headache or tinnitus alcohol or drug abuse pregnant patients breastfeeding patients