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Farmer's lung

**Farmer's lung**
*Classification & external resources*
ICD-10	J67.0
ICD-9	495.0
DiseasesDB	29636
eMedicine	med/771
MeSH	D005203

Farmer's lung is an hypersensitivity pneumonitis induced by the inhalation of biologic dusts coming from mouldy hay or other agricultural products. The immune response is most often initiated by exposure to thermophilic actinomycetes.

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It is an example of extrinsic allergic alveolitis.

v • d • e Pathology of respiratory system (J, 460–519)
Acute upper respiratory infections	Upper respiratory tract infection · Common cold · Rhinitis · Sinusitis · Pharyngitis (Strep throat) · Tonsillitis · Laryngitis · Tracheitis · Croup · Epiglottitis
Influenza and Pneumonia	Influenza · Pneumonia (Viral, Bacterial, Bronchopneumonia) · Severe acute respiratory syndrome
Other acute lower respiratory infections	Bronchitis (Acute, Chronic) · Bronchiolitis
Other diseases of upper respiratory tract	Vasomotor rhinitis · Hay fever · Atrophic rhinitis · Nasal polyp · Deviated septum · Adenoid hypertrophy · Peritonsillar abscess · Vocal fold nodule · Laryngospasm
Chronic lower respiratory diseases	Emphysema · COPD · Asthma · Status asthmaticus · Bronchiectasis
Lung diseases due to external agents	Pneumoconiosis (Coalworker's pneumoconiosis, Asbestosis, Silicosis, Bauxite fibrosis, Berylliosis, Siderosis) · Byssinosis · Hypersensitivity pneumonitis (Farmer's lung, Bird fancier's lung)
Other, principally affecting the interstitium	Acute respiratory distress syndrome · Pulmonary edema · Hamman-Rich syndrome · Interstitial lung disease
Suppurative and necrotic conditions of lower respiratory tract	Lung abscess · Pleural effusion · Empyema
Other	Pneumothorax · Hemothorax · Hemopneumothorax · Mendelson's syndrome · Respiratory failure · Atelectasis · Mediastinal emphysema · Mediastinitis
see also congenital (Q30–Q34, 748)

v • d • e Health science - Medicine - Allergic conditions
Respiratory system	Allergic rhinitis · Asthma · Hypersensitivity pneumonitis · Eosinophilic pneumonia · Churg-Strauss syndrome · Allergic bronchopulmonary aspergillosis · Farmer's lung
Skin	Angioedema · Urticaria · Atopic dermatitis · Allergic contact dermatitis · Hypersensitivity vasculitis
Blood and immune system	Serum sickness
Circulatory system	Anaphylaxis
Digestive system	Coeliac disease · Eosinophilic gastroenteritis · Food allergy · Milk intolerance
Nervous system	Eosinophilic meningitis
Genitourinary system	Acute interstitial nephritis
Other conditions	Drug allergy · Allergic conjunctivitis