Thank you for writing in HCM.
Cough persisting for more than 2-3 week is really a matter of concern.
There are many possibilities like
1. It may be due to Gastric regurgitation
/acid peptic disorder for which head end of bed to be raised besides treatment of drug like pantoprazole
40mg or similar group drug.
2.It may be a drug induced..more commonly ACE inhibitor
gr of drug used for Hypertension
or Some other cardiac disease.this mandate change of drug to ARB gr drug.
3.Smokers cough should be kept in mind in Chronic smoker.
4.Cough Variant asthma
may cause similar possibitites.easily curable by medicine but need confirmation of diagnosis before treatment.
5.TB is very much common in our country..and easly curable on proper treatment...and for every cough persist more than two week Sputum examination for acid fast bacilli is must in our country.
6.Some serious condition to be rule out like lung cancer by Chest Xray PA view if it is suspected.
So I would like to suggest meet an pulmonologist for proper diagnosis and treatment.