Idiopathic interstitial pneumonia or noninfectious pneumonia is a class of diffuse lung diseases. Idiopathic interstitial pneumonia (IIP), or noninfectious pneumonia are a class of diffuse lung diseases. NGU, sometimes called nonspecific urethritis (NSU), has both infectious and noninfectious causes. Chronic dacryoadenitis is usually due to noninfectious inflammatory disorders. DIAM is among these noninfectious causes of aseptic meningitis. Additionally, a blocked tear duct may be another noninfectious cause of neonatal conjunctivitis. Pustular psoriasis appears as raised bumps filled with noninfectious pus (pustules). Laryngitis can be infectious as well as noninfectious in origin. Noninfectious immunodeficiency-related cutaneous conditions are caused by T-cell or B-cell dysfunction. Once infectious causes ruled out, noninfectious causes should be investigated. Tenosynovitis can be either infectious or noninfectious. Bioaerosols are also associated with some noninfectious airway diseases, such as allergies and asthma. It may be caused by infectious or noninfectious means. Other retrodiagnoses include noninfectious diseases as well. Because the bacteria remains inactive, the late latent syphilis does not spread and is noninfectious.