Cough. Coughs lasting longer then a few months require a work up. Pulmonary evaluation would commonly include a pulmonary function test to look for evidence of asthma. Also, cough could be a sign of gastroesophageal reflux that would require medicine like prilosec. Additionally, we may order a ct scan of the chest. Finally, we review daily meds to see if you are experiencing a cough side effect.
Bronchoscopy. Should consult with a pulmonologist and possibly undergo a bronchoscopy to check your airways, which a chest x-ray would not be able to evaluate.