Anorexia nervosa is a serious mental disorder that primarily affects young women, having poor prognosis and high mortality, which reaches 25%. Endocrine, metabolic, immunologic and hematologic medical complications are among the most frequently mentioned in the literature. Pulmonary complications are rare and there is little evidence published. In this article, a case of pulmonary bullae and tension pneumothorax in a patient with anorexia nervosa is described, and a brief discussion on the possible pathophysiology when compared to the few published similar cases is made.