Four cases of severe motion sickness

Abstract

I herein report four cases of severe motion sickness. All cases were extremely prone to sickness in cars and buses. One case was more prone to sickness on boats and planes than in cars and buses. The level of sickness on trains differed among the four cases. One case experienced sickness when driving his own car. In two cases, there was no phenomenon of becoming accustomed to the motion. I conducted a questionnaire survey on the cases' nausea other than motion sickness. All cases exhibited nausea when on revolving playground equipment and swings in amusement parks, and exhibited nausea when rolling forward on a mat or horizontal bar. Three cases reported that they started to feel unwell when riding an elevator. Two cases exhibited nausea when watching cinema or television screens. Motion sickness is related to disequilibrium. It can be inferred that individuals, who are prone to nausea and vomiting readily suffer from motion sickness. Further studies on severe motion sickness may elucidate the mechanisms that underlie the condition.