Coronavirus disease 2019 (COVID-19) has rapidly spread throughout the world since December 2019, and it was declared as a pandemic by the World Health Organization (WHO) on 11 March, 2020. (1,2) Infections have been found in more than 200 countries, areas or territories and more than 6 million people were confi rmed with COVID-19, up to June 2020. (3) COVID-19 is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which induces infl ammation and infi ltration in lungs and can lead to systemic inflammatory cytokine storms. (4,5) As of June 2020, no vaccine or specifi c effective drugs have been identifi ed for COVID-19, and supportive treatments are mainly used to manage its symptoms. Through its thousands of years' history of development, Chinese medicine (CM) has acquired abundant clinical experiences and effi cacy in the prevention and treatment of epidemics and endemic diseases. In CM, COVID-19 pertains to a type of "plague" which is caused by evil qi. The characteristics of the evil qi include cold, dampness, and toxin. According to CM theory, Wuhan as center of the epidemic is a city with many lakes and rivers that has high humidity. The climate of Wuhan suggests a relationship with dampness, and patients diagnosed with COVID-19 often have gastrointestinal symptoms such as nausea, vomiting, abdominal distension, and