Peripheral	Common conditions
Gastrointestinal	Distension, gastro-oesophageal reflux disease, gastritis, peptic ulcer disease, pancreatitis, gallbladder disease, hepatitis, aerophagia, bowel obstruction, neoplasm
Non-gastrointestinal	Thoracic (myocaridal infarction, pericarditis, aortic aneurysm, pneumonia, bronchitis, tuberculosis), neoplasm, rhinitis, otitis, pharyngitis