<s>[INST] Hi i have had a persistent cough for 20 weeks now i had a chest x ray last week and that came back clear. I ve had trouble breathing ever since then that will come and go, doctors think i may have asthma but the inhaler doesn t help with my breathing or coughing after ive used it. Just wondered if you could give me any alternatives as to what this might be thank you. [/INST] HI persistent cough has few reasons. 1 post nasal drip  persistant mucus coming from back of nose into throat 2 gastrites 3 vocal cord problems 4 BP drugs so again consult your GP for review Thanks </s>