Can anyone help please. I have under active thyroid on 50 mcg thyroxine. Being diagnosed 3 year and every winter get a itchy cough, which last for months and drives me mad. It has already started again this week. The itch is where my voice box/thyroid is, and it feels like the sputum I am expectorating is generated from here too, not my chest. Doctor feels I just will have to ride though it. Any ideas please. Thank you.