My son 3yrs 10months always have cough problem, every month needs to meet the paediatrician, always doctor says it's allergic cough n suggests few syrups , after using these syrups for few weeks coughs reduce n on n off he has this problem, so to rule out this problem completely what should be done, which tests to be taken, no doctor takes this seriously, all tell it's allergic cough or seasonal flue n just prefer syrups, I even asked if he is asthamatic but doctor says nothing like that, please doctors I need permanent solution for this please suggest, every month because of this coughs I should visit his paediatrician