Hi welcome to the health care magic You are having chronic cough... For that following work up done.... -Auscultation -Chest x ray digital PA view -pulmonary function test (will diagnose and distinguish between obstructive and restrictive disease) According to cause specific treatment given If no specific cause found like bronchitis, copd, pneumonia than it could be allergic cough and for that fexofenedine like drug prescribed CBC and AEC count can be done for that... For non specific dry cough antihistaminic drug like phenylephrine prescribed Take care Consult pulmonologoist for examination and further work up accordingly