[Medically unexplained persistent pain syndrome: psychoanalytic approach].

Chronic persistant pain is very challenging as the patient and his/her therapist are confronted with a lack of explanation about the origin of pain. The relationship has also to face many obstacles such as psychological strain or psychosocial tensions such as disagreements about the patients working capacity. Nevertheless continuing attention from a solid and secure therapist may progressively lead to changes in pain experience, the emergence of emotions and improved therapist patient interactions.