A 60 year old male was referred to a tertiary referral centre with a chronic dry cough. He was a lifelong non-smoker. Clinical examination was unremarkable. AssessmentIGE, RAST to common allergens, eosinophils and alpha one anti-trypsin were within normal limits. Barium swallow did not show any oesophageal dysmotility, gastric outlet obstruction or reflux. Normal pulmonary function testing with no reversibility noted post bronchodilator.