This study analyzes stress, the main causes of occupational stress, and the prevalent symptoms of stress among technical and administrative workers at the Instituto Federal de Educação Tecnológica [Federal Institute of Technical Education] in the Brazilian state of Minas Gerais. In terms of theory, we used as reference the Theoretical Model of Explanation of Occupational Stress, developed and validated by Zille (2005) and adapted for this study. In terms of methodology, it is characterized as a descriptive, quantitative approach through a case study. The results showed that 76.3% of the workers surveyed had some level of stress, ranging from mild/moderate to heavy. Regarding the sources of occupational stress, the factors that most contributed to the occurrence of stress were living a fast-paced life, doing more and more work in less time; and having a very full day, with lots of commitments with little or no free time. In relation to symptoms of stress, the prevalent ones were fatigue, pain in the neck and shoulder muscles, and irritability.