Thyrotoxicosis after gastric bypass. 
Obesity surgery is the optimal therapy for morbid obesity.  A case is presented of a young woman who developed thyrotoxicosis, believed to be part of subacute thyroiditis, some days after undergoing laparoscopic Roux-en-Y gastric bypass.  This clinical entity can present difficulties in differential diagnosis from potential postoperative complications.  The correct diagnosis and adequate treatment made possible a favorable recovery.