Several autonomic reflexes were dramatically affected after sympathectomy for hyperhidrosis

major effects on local blood flow and temperature are elicited by TES. Complex autonomic reflexes are also affected. The patient should be completely informed before surgery of the side effects elicited by transthoracic endoscopic sympathicotomy (TES).
http://www.ncbi.nlm.nih.gov/pubmed/18540897
 2008 Dec;118(6):402-6.