Inclusion Criteria:  First consultation for Low Back Pain with the practitioner Having a diagnostic of chronic non-specific Low Back Pain based on the French Haute Autorité de Santé guidelines (https://www.has-sante.fr/upload/docs/application/pdf/2019-04/fm_lombalgie_v2_2.pdf): excluding specific Low Back Pain (tumor, infection, inflammation, etc.) no red flag Low Back Pain for more than 3 months Having had the French validated version of: evaluation of pain intensity with Visual Analog Scale STarT Back Screening Tool questionnaire Dallas Pain questionnaire  Exclusion Criteria:  Specific Low Back Pain (rheumatologist disease, tumoral compression, central neurological pathology, etc.) Psychiatric disorder (apart from the usual co-morbidities of chronic low back pain) Pregnancy or breastfeeding Being under guardianship or curatorship Deprivation of liberty or legal protection measure Being unable to give consent Being unable of fill out a questionnaire