From these results and the literature reviewed, a single case design could be an alternative method for research in the Pain Unit. However, the implementation of this type of methodology can be very costly due to the continuous evaluation of the evolution of the patient. In this sense, several studies have already shown that mobile applications (app) can effectively control the evolution of a wide range of pathologies in health settings . In fact, a recent controlled clinical study found that ecological records performed with mobile app had greater reliability than paper-and-pencil records.