This case features an adult male with moderate social anxiety disorder and mild depressive symptoms who showed an initial positive response to an earlier experience of cognitive behavior therapy, but then relapsed when he started avoiding social situations again because of continuing beliefs that experiencing anxiety was unacceptable. His treatment at our clinic focused on shifting unhelpful thinking about the likelihood and consequences of becoming anxious and reengaging in avoided social situations so he could learn to tolerate negative affect and uncertainty. The treatment approach draws from cognitive behavioral models of social anxiety and highlights advances in clinical science, especially recent work on the causal role of interpretation biases (the tendency to assign negative or threatening meaning to ambiguous situations) in the maintenance and reduction of anxiety. (C) 2017 Wiley Periodicals, Inc.