prior to surgery
. If so, it was unrelated to the surgery
and might have been a reason to postpone the surgery
. If I am mistaken and you actually developed the cough post operatively, on the very day of surgery, then there could be a relationship, not with the thyroid removal, but related to the anesthesia, presumably with intubation. And it could bear a relationship to your underlying asthma, in this case aggravated either by the viral infection or by the intubation.
But that is all past.