Tumors: – Small cell lung cancer – Mesothelioma – GI malignancy – Pancreatic carcinoma – Lymphoma – Sarcoma |
Pulmonary causes: – Pneumonia – Tuberculosis – COPD |
Intracranial causes: – Tumors – Subdural hematoma – Head trauma – Meningitis |
Drugs |
Miscellaneous causes: – HIV – Severe nausea – Pain – Idiopathic |
COPD, chronic obstructive pulmonary disease; GI, gastrointestinal; HIV, human immunodeficiency virus. |