Motion sickness could significantly impact occupants’ experiences in vehicular environments, which has stimulated numerous studies investigating factors contributing to its severity in both human-driven and autonomous vehicles. This research aims to explore the primary themes of recent motion sickness studies and to identify the critical factors that are influenced by the type of engine and the driving entity. To this end, we have compiled research articles through a systematic literature review protocol, focusing on the past five years, which either carried out experimental investigations or mathematical simulations related to motion sickness. By applying network analysis to the keywords of these articles, we have identified the trends and thematic structure within the current body of research. Furthermore, we have assessed how these structures and trends differ according to the type of vehicle engine and driving entity. The results of this study are expected to provide insights and guidance for researchers researching motion sickness.