OBJECTIVE To explore experiences of change among participants in a randomized clinical trial of mindfulness-based stress reduction (MBSR) for anxiety disorders. METHODS Semi-structured interviews were conducted to explore the subjective experiences of change for individuals with anxiety disorders after a course in MBSR. Interviews were analysed employing hermeneutic-phenomenological thematic analysis. RESULTS Five main themes were identified: 1) Something useful to do when anxiety appears, 2) Feeling more at ease, 3) Doing things my anxiety wouldn't let me, 4) Meeting what is there, and 5) Better-but not there yet. Most participants used what they had learned for instrumental purposes, and described relief from anxiety and an increased sense of personal agency. A few reported more radical acceptance of anxiety, as well as increased self-compassion. CONCLUSIONS Participants of MBSR both describe mindfulness as a tool to "fix" anxiety and as bringing about more fundamental change towards acceptance of their anxiety. The complexity of reported change corresponds with better handling of areas representing known transdiagnostic features of anxiety disorder, such as dysfunctional cognitive processes (including attentional biases), emotional dysregulation, avoidance behaviours, and maladaptive self-relatedness. This supports MBSR as a transdiagnostic approach to the treatment of anxiety disorders.