Permanent lung damage can arise due to one's inability to recognize the cause of symptoms.<unk>  occurs because repeated exposure to antigens, found in the mold spores of hay, crops, and animal feed, triggers an allergic reaction within the<unk> 's immune system. The defense mechanisms of the body present as cold and<unk> u-like symptoms that occur in individuals who experience either acute or chronic reactions. The mold spores are inhaled and provoke the creation of IgE antibodies that circulate in the bloodstream, these types of immune response are most often initiated by exposure to thermophilic actinomycetes (most commonly Saccharopolyspora rectivirgula), which generate IgG-type antibodies. Following a subsequent exposure, IgG antibodies combined with the inhaled allergen to form immune complexes in the walls of the alveoli in the lungs. This causes<unk> uid, protein, and cells to accumulate in the alveolar wall which slows blood-gas interchange and compromises the function of the lung. After multiple exposures, it takes less and less of the antigens to set off the reaction in the lung.
Farmer's lung
Bird fancier's lung
Metsovo lung
World Trade Center lung
Saber-sheath trachea
Underwood's septa
Flock worker's lung
Bronchitis kettle