This paper explores the relationship between the problem of dis/harmony in Jakob von Uexküll’s Umwelt theory and the inclusion of experiences of disability, disease, or trauma, in said theory. It starts with discussions of dis/harmony and dis/ability in Uexküllian studies, from Uexüll’s very own work on Umwelt theory to the contemporary commentaries and studies of said theory. It first articulates how Uexküll’s focus on harmony provided poor conditions to account for dis/ability, while commenting on points where Uexküll offered direct engagement (...) with or openness to situations of dis/harmony and dis/ability. It then forays into post-Uexküllian research on dis/ease and pathology and suggests that the work of Weizsäcker, Kurt Goldstein and Georges Canguilhem might constitute a useful step aside to allow Umwelt theory better to account for these situations. From then on, the article shows how contemporary investigations into the mutability of Umwelten in the context of the ecological crisis allows for the development of a phenomenology of Umwelt crises and trauma. Finally, the ethological dimension of Umwelt theory is taken up as a way to formulate a philosophy of intra-specific ethological diversity and ethological divergence, and the example of autism is read into the theoretical framework of Umwelt thinking. (shrink)