Infectious
Bronchitis
Pneumonia
Lung abscess
Tuberculosis
Plague
Aspergilloma
Coccidioidomycosis
Neoplastic
Lung cancer
Metastatic cancer
Cardiovascular
Pulmonary embolism
Congestive heart failure
Pulmonary hypertension
AV malformation
Mitral stenosis
Alveolar hemorrhage<unk> s<unk> 
Granulomatosis with polyangiitis (Wegener)
SLE
Hematologic
Uremia
Platelet dysfunction (ASA, clopidogrel)
Anticoagulant therapy
Traumatic
Foreign body aspiration
Ruptured bronchus
Inflammatory
Bronchiectasis
Cystic fibrosis
Miscellaneous
Cocaine inhalation (crack lung)
Catamenial pneumothorax<unk> 
Cystic fibrosis
Epistaxis
Blood-laced mucus from the sinus or nose area
Upper GI bleeding
Bronchitis
Pneumonia
Lung abscess
Tuberculosis
Plague
Aspergilloma
Coccidioidomycosis
Lung cancer
Metastatic cancer
Pulmonary embolism
Congestive heart failure
Pulmonary hypertension
AV malformation<unk> 
Granulomatosis with polyangiitis (Wegener)
SLE
Uremia
Platelet dysfunction (ASA, clopidogrel)
Anticoagulant therapy
Foreign body aspiration
Ruptured bronchus
Bronchiectasis
Cystic fibrosis
Cocaine inhalation (crack lung)
Catamenial pneumothorax<unk> 
Cystic fibrosis
Epistaxis
Blood-laced mucus from the sinus or nose area
Upper GI bleeding
Poststreptococcal glomerulonephritis
Hemolytic-uremic<unk> 
Henoch-Schonlein purpura
IgA nephropathy
Lupus nephritis
Alport<unk> <unk> 
Paraneoplastic
Goodpasture syndrome
Infectious
Nephrogenic systemic fibrosis
Bronchitis
Drug rash with eosinophilia and systemic symptoms syndrome
Pneumonia
Eosinophilic granulomatosis with polyangiitis
Lung abscess