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This Heat-Related Illness Clinician's Guide, available in English and Spanish, is a 12-page full-color guide to the many overlapping risks that outdoor workers like farmworkers may encounter, that increase their risk of heat-related illnesses. It covers the many overlapping factors that may increase a worker's risk for HRI, including the basic environmental, metabolic, and physical factors as well as social, occupational, behavioral conditions and more that amplify heat stress by worsening heat storage or impairing heat dissipation across those three factors. This updated version also features a new tear-out one-pager to share directly with outdoor workers on the symptoms of various heat-related illnesses and what to do if a coworker experiences one. There is a special section on chronic kidney disease of nontraditional origin, as well as an updated table with recommended questions for patients and an extensive list of new tools and resources. This guide, updated in 2026, was created by Migrant Clinicians Network and Farmworker Justice.