My lungs are clear but I have this nagging cough, especially at night when I try to lay down in bed. I just had a heart ablation done, there is a possibility that my thyroid may be contributing to this condition. I have to spend some time sitting straight up in bed for awhile to calm the cough. Could a thyroid condition have caused my arterial flutter in the first place? Secondly, what can I do about the cough.