Based on the Classical literature on one of the major diagnostic methods in Chinese Medicine, this key resource has been created in response to the growing need for clear and practical guidance on how to apply tongue diagnosis in clinical practice in a post-antibiotic era at high risk of epidemy. This hands-on guide breaks the theory of Chinese Tongue Diagnosis down into accessible explanations and offers detailed descriptions of clinical applications, all of which is supplemented with charts, tables, and colour photos based on Ioannis Solos's decades worth of experience and knowledge. Images from the Covid-19 pandemic are used as examples of how tongue diagnosis can assist in recognising and managing the impact of Covid on the body. Each tongue is discussed in relation to how it is connected to the Shang Han Lun theories and classic texts are translated and enhanced with extensive commentary. Ioannis Solos includes a detailed introduction on how tongue diagnosis has assisted in major historical and modern epidemics allowing practitioners to feel confident in their treatment of modern diseases.