Epistaxis
Oropharynx bleeding
Hematemesis
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 syndromes
Goodpasture syndrome
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
Goodpasture syndrome
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
Goodpasture syndrome
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
Goodpasture syndrome
Cystic fibrosis
Epistaxis
Blood-laced mucus from the sinus or nose area
Upper GI bleeding
Hemoptysis
Epistaxis
Tracheostomy bleeding
Oropharynx bleeding
Chest wall pain
Hematemesis
Chest pain 
Infectious