NCIthesaurus has symptom idiopathic interstitial pneumonia nonspecific interstitial pneumonia An idiopathic interstitial pneumonia that occurs mainly in women, people who do not smoke, and people younger than 50 years with no known cause or risk factors. Lung biopsies may show predominantly interstitial inflammation or fibrosis or a combination of inflammation and fibrosis. A dry cough and shortness of breath develop over 6 to 18 months. Low-grade fever and a feeling of illness (malaise) may occur. UMLS_CUI:C1290344 disease_ontology DOID:2801 NCI:C35717 NSIP SNOMEDCT_US_2025_09_01:129452008 dry cough