Most of the time this task is a complex one and professionals have to build their diagnostic on a body of clinical, paraclinical and more social, familial and psychological evidences. No clear protocol exists to help the professionals with differentiating the continuing activity of a somatic problem, some painful sequelae, a low threshold for the perception of pain, and psychological symptoms with somatic expression. This diagnostic process is lying on sub-clinical symptoms that investigators have to elicit in order to help professionals to better support their patients.