Tehran University of Medical Sciences Iranian Journal of Allergy, Asthma and Immunology 1735-1502 11 1 2012 03 15 77 79 EN Gianni Pala Allergy and Immunology Unit, Fondazione ‘Salvatore Maugeri’, Institute of Care and Research, Scientific Institute of Pavia, Italy Patrizia Pignatti Allergy and Immunology Unit, Fondazione ‘Salvatore Maugeri’, Institute of Care and Research, Scientific Institute of Pavia, Italy Gianna Moscato Allergy and Immunology Unit, Fondazione ‘Salvatore Maugeri’, Institute of Care and Research, Scientific Institute of Pavia, Italy 2015 10 01 Occupational asthma has been reported  to  be the most  common  chronic respiratory occupational disease in many developed countries, and  as with other  occupational lung diseases, occupational asthma is potentially preventable. We report the case of a 24-year-old baker who experienced pneumomediastinum as a consequence of workplace exposure. This is the first report of pneumomediastinum as an acute complication of occupational asthma, and it exemplarily shows that the lack of medical surveillance at the workplace may lead to an acute, although unusual, complication. https://ijaai.tums.ac.ir/index.php/ijaai/article/view/334 https://ijaai.tums.ac.ir/index.php/ijaai/article/download/334/334