ILD stands for Interstitial Lung Disease, which is a category of lung disorders that includes several different conditions. Synonyms for ILD include diffuse parenchymal lung disease, interstitial pneumonia, and pulmonary fibrosis. These terms all refer to the same group of lung conditions that affect the interstitial tissues and spaces in the lungs. Other synonyms for ILD may include idiopathic interstitial pneumonia, cryptogenic organizing pneumonia, and hypersensitivity pneumonitis. While each of these types of interstitial lung disease has its own unique characteristics and causes, they all involve inflammation and scarring of the lungs' interstitial tissues, which can lead to significant breathing difficulties and other health complications.