eDOL is an application offered to patients followed in the Chronic Pain Structure, as part of the eDOL cohort study. It aims to monitor patients' symptoms (pain and physical and psycho-emotional repercussions) in order to allow the healthcare team to best adapt their care. eDOL also allows patients to benefit from comprehensive educational advice (pain management, emotion and sleep management, education on drug and non-drug therapies, getting back into movement, advice for practical life).