<unk>  <unk>  or extrinsic allergic alveolitis (EAA) is a syndrome caused by the repetitive inhalation of antigens from the environment in susceptible or sensitized people. Common antigens include molds, bacteria, bird droppings, bird feathers, agricultural dusts, bioaerosols and chemicals from paints or plastics. People affected by this type of lung inflammation<unk>  are commonly exposed to the antigens by their occupations, hobbies, the environment and animals. The inhaled antigens produce a<unk>  immune reaction causing inflammation of the airspaces (alveoli) and small airways (bronchioles) within the lung.<unk>  may eventually lead to interstitial lung disease.
Hypersensitivity pneumonitis
Idiopathic pulmonary fibrosis
Chemical pneumonitis
Acute eosinophilic pneumonia
Diffuse panbronchiolitis
Cryptogenic organizing pneumonia
Atypical pneumonia
Eosinophilic pneumonia