Ask the Doctor: Could my cough lead to a bigger problem?

Dear doctor, I’m 22 years old. For about three months now, I’ve had a very persistent cough. I have tried all the medication that doctors have given me but nothing seems to work. I rarely get cough and I’m not a smoker. I never hang around smokers either.
Dr. Rachna Pande
Dr. Rachna Pande
Dr. Rachna Pande