Sympathetic chain injury called 'complication'. Now this same 'complication' is marketed for people with palmar hyperhidrosis and blushing.

Cervical sympathetic chain injury is a rare complication of surgery for thyroid and parathyroid conditions.
ANZ Journal of Surgery. 74(6):442-445, June 2004.
HARDING, JANE L. MB BS; SYWAK, MARK S. MB BS, FRACS; SIDHU, STAN MB BS, PhD, FRACS; DELBRIDGE, LEIGH W. MD, FRACS