This article describes the ways in which group identifications and stereotypes can inform our understanding of cancer prevention and treatment as well as more general social processes surrounding the experience of cancer. From a perspective grounded in social identity theory, we describe the ways in which understanding primary identities (i.e., those associated with large social collectives such as cultural groups), secondary identities (i.e., those associated with health behaviors), and tertiary identities (i.e., those associated with cancer) can help explain certain cancer-related social processes. We forward a series of propositions to stimulate further research on this topic.This article examines the role of social group memberships in health communication. Much work has focused on the ways in which individuals are influenced by their group memberships. People orient to one another in terms of not only individual characteristics but also group identifications. This occurs in terms of individuals' perceptions of their own groups (social identities), and their perceptions of others' group memberships (e.g., stereotypes). Identities and stereotypes influence how we communicate with others. We term this an intergroup approach, grounded in the pioneering work of Tajfel (Robinson, 1996;Tajfel & Turner, 1986). We contend that intergroup processes are relevant to health communication. Although HEALTH COMMUNICATION, 15(2),[145][146][147][148][149][150][151][152][153][154][155][156][157][158][159]