Allergic Bronchopulmonary Aspergillosis (ABPA) is a condition caused by an allergic reaction to the fungus Aspergillus. This fungus is commonly found in the environment, particularly in decaying organic matter. In individuals with ABPA, exposure to Aspergillus can lead to inflammation in the lungs, resulting in symptoms such as coughing, wheezing, and difficulty breathing. ABPA is often seen in people with underlying respiratory conditions, such as asthma or cystic fibrosis. Diagnosis typically involves a combination of clinical evaluation, imaging studies, and specific blood tests to detect antibodies against Aspergillus. Treatment usually includes corticosteroids to reduce inflammation and improve lung function.