This research aims to determine the number of articles dealing with overtourism and undertourism. The authors assume that there is not enough literature dealing with undertourism, while the concept of overtourism has been researched extensively. Undertourism is an underrated concept that requires further research. The selected 41 papers were collected from Web of Science (WOS) and Scopus databases according to basic search criteria. A quantitative and qualitative approach was used to reveal important facts about authors, sources, under topics, co-citation, and to classify selected papers according to the methods, techniques, and themes examined. The literature review results revealed that there are numerous papers about overtourism but few about the concept of undertourism. The paper's deficit concerning undertourism demands further research, with a precise and clear definition of the concept, its history, and implications for the sustainability of expanding the existing tourism paradigm.