Why is language so important to the ways that we make sense of anxiety? This book uses corpus-assisted discourse analysis to examine 23 million words of text posted to a forum for people with anxiety. It shows how linguistic techniques such as catastrophisation and anthropomorphisation can result in very different conceptualisations of anxiety, as well as how aspects of identity such as age, sex and cultural background can impact on understandings of anxiety and how it ought to be managed. It tracks the changing identities of posters, from their first posts to their last, and incorporates a range of corpus-based techniques to examine the language data, enabling consideration of interaction between participants and features associated with online forms of communication such as emoji. It ultimately provides a step towards a better understanding of different responses to anxiety and aims to promote further engagement with this topic in the field of Applied Linguistics.