Bronchiolitis obliterans organizing pneumonia, often referred to as BOOP, is an inflammatory lung disorder, according to the National Organization for Rare Disorders. It causes inflammation of both the bronchioles and alveolar lung spherical units. In the majority of cases, bronchiolitis obliterans organizing pneumonia has no known cause.
Symptoms of BOOP typically develop slowly over a period of weeks or months and include a persistent cough, sore throat, weight loss, fatigue and shortness of breath, especially upon exertion. In rare instances, patients develop chest pain, joint pain or night sweats, according to the NORD. Treatment typically requires the use of anti-inflammatory, corticosteroid medication, such as prednisone.