RESUMEN
Nowadays, chronic pain treatment units are comprised by multidisciplinary work teams on which the contribution by each professional involved contributes to the team objective to handle and control pain. Out of all the forms of treatment and action plans developed for patients which deal with all the biological, psychological and social needs related to their experiences with chronic pain, in this article the authors concentrate exclusively on those technological and invasive procedures that are most frequently carried out by medical teams in chronic pain units. In this sense, nurses play an active participatory role in those procedures carried out, mainly in outpatient clinics where a patient is treated as an outpatient and nurses perform clinical services without the need of hospitalization.