Even though the acute crisis which was the Covid-19 pandemic has ended, millions of people still suffer from chronic long-term symptoms, what has now been called 'Long Covid'. What is long covid, and how can we treat these patients? This book seeks to investigate long covid, both from a scientific perspective as well as from a traditional Chinese medicine perspective, in order to better understand what is behind this lingering disease. By combining scientific long covid research with his knowledge of traditional herbal medicine, author Michael Keane D.Ac. seeks to present a new theory of long covid as a case of chronic lingering pathogens, a variation of what is known in traditional medicine as 'Gu Syndrome'. This is a topic which has been discussed in traditional medicine since ancient times. The information collected in this book will help you decide for yourself whether long covid really may be a modern manifestation of Gu Syndrome. Diagnostic categories and treatment strategies for long covid Gu Syndrome are presented, as well as in-depth research into individual herbs which are used in traditional Gu Syndrome herbal formulas as well as their potential benefits in the context of long covid. The information in this book seeks to equip herbal medicine practitioners with a framework and available evidence to create custom herbal formulas tailored to their individual patients presenting with long covid Gu Syndrome symptoms.