We describe the case of a patient with a two-year history of adult dermatomyositis (DM) who developed malabsorption revealing celiac disease. Our observation raises the question of an association between DM and celiac disease as part of a continuum, suggesting that celiac disease may be included within the spectrum of the gastrointestinal manifestations of DM and polymyositis (PM). From a practical point of view, our data indicate that the diagnosis of celiac disease should be suspected in PM/DM patients exhibiting malabsorption syndrome. Based on our findings, we further emphasize that an evaluation for celiac disease, including anti-gliadin antibodies, anti-endomysium antibody and tissue trans-glutaminase antibodies should be considered in PM/DM patients presenting with unusual and unexplained gastrointestinal features. This could lead to the early management of such patients, resulting in decreased morbidity (i.e., malnutrition and malignancy) related to misdiagnosed celiac disease.