The gut-lung axis in celiac disease: a narrative review of pulmonary manifestations and pathogenic mechanisms.

Aim: This narrative review synthesizes current evidence on the association between Celiac disease (CD) and pulmonary disorders, explores underlying mechanisms, and highlights clinical implications and future research directions. Background: CD is a chronic autoimmune enteropathy triggered by gluten ingestion in genetically predisposed individuals. Although it primarily affects the small intestine, emerging evidence implicates extraintestinal involvement, particularly of the respiratory system, suggesting a potential gut-lung axis. Methods: This narrative review was conducted using PubMed, Scopus, and Web of Science, covering literature published in English up to October 2025. Search terms combined 'celiac disease' OR 'coeliac disease' with ('lung disease' OR 'pulmonary' OR 'respiratory tract' OR 'asthma' OR 'bronchiectasis' OR 'COPD' OR 'interstitial lung disease' OR 'pulmonary hemosiderosis'). Inclusion criteria were peer-reviewed human studies reporting pulmonary manifestations in celiac disease. Exclusion criteria included non-English language, in vitro or animal studies, abstracts without full text, and insufficient clinical or mechanistic data. This was not a systematic review, and therefore no PRISMA flow diagram was generated." Results: Large-scale registry studies in Scandinavia and case-based evidence across Europe and Asia support a spectrum of pulmonary manifestations in celiac disease, ranging from asthma and chronic cough to rare but life-threatening idiopathic pulmonary hemosiderosis. Asthma and chronic cough were the most commonly observed associations, with population-based studies reporting an elevated risk. Case reports and small cohorts described co-occurrence with bronchiectasis and interstitial lung disease, while rare cases confirmed links to idiopathic pulmonary hemosiderosis (Lane-Hamilton syndrome). Proposed mechanisms include systemic immune activation, increased intestinal and pulmonary permeability, micronutrient deficiencies, IgA deficiency, and chronic inflammation. Notably, several studies reported symptom improvement or resolution following a gluten-free diet (GFD). Conclusion: Pulmonary manifestations of CD, though relatively uncommon, are clinically significant and often reversible with dietary intervention. Greater awareness, early recognition, and mechanistic research are essential to optimize patient outcomes.