Stigma is an intense human experience. Stigma causes suffering and worsens health. This training focuses on recognizing and challenging stigma. In the first section, we explain what stigma is, how it feels, and how to recognize it. In the second section, we explore the ways stigma is entangled in the practices and assumptions of healthcare professionals, often unwittingly. In our final section, we identify ways that health professionals can help recognize and reduce stigma to improve patient outcomes and improve population health.