The purpose of this study is to contribute to a better knowledge of the Burnout syndrome within the Portuguese Firefighter Volunteers. The Burnout syndrome is a pathology which consists in the presence of prolonged stress response in the individual, in that stressful factors, emotional and interpersonal, are the result of work, that includes chronic fatigue, inefficiency and denial. It will also refer to the relation between Burnout, Job-Demands-Control (JDC) and Satisfaction with Social Support (ESSS). The investigation follows the model of analytical epidemiological studies used to exam associations formed by hypothesis of casual relation. It was conducted an empirical study, following the model of analytical epidemiological study, cross-sectional type ie cross and prevalence.The study technique adopted was the questionnaire, and for the Burnout evaluation was used the Maslach Burnout Inventory-General Survey (MBI-GS), of Masclach et al 67 , the Scale of Job Demands and Control (JDC) of Karasek 7 , adapted by Castanheira 161 , and the Scale of Satisfaction with Social Support (ESSS) 100. The study focused a total population of 791 firefighters from various regions