Objective:To evaluate the impact of the training strategy of the Escuela de Pacientes (School of Patients) on the use of health services among people with chronic diseases. Method: Quantitative design study of pretest and posttest evaluation with a population of 3,350 chronic patients of the Escuela de Pacientes (Andalusia, 2013(Andalusia, -2015. A questionnaire adapted from the Stanford University was used. It measured the selfperceived health, number of health visits, and level of trust and communication with health personnel. A descriptive and bivariate study, a correlation study and a pretest/ posttest net gain analysis were performed. Results: Participation of 964 patients (28.8% of the population), of which 18.8% were men, mean age 56 years. Training increased trust in Primary Care (PC) and Hospital Care (HC) professionals (0.44 and 0.65 points), medical visits decreased by 25%, and hospital admissions fell by 51% with statistically significant differences by sex and disease. The correlation index between trust in professionals and use of health services was -0.215. Conclusion: The training strategy had a positive impact on the use of health services and trust in health professionals, and were identified areas of improvement from which recommendations are established.