Abstract The level of thyroidectomy-related regret in patients with clinically low-risk papillary thyroid microcarcinoma (PTMC) and the determinants of decision regret are largely unknown. Here, we show that 319 (24.2%) of those who undergo thyroidectomy and 4 (3.4%) who undergo active surveillance (AS) express heightened regret based on validated decision regret scale (DRS) scores in the first online survey (P