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很多人都有晕车的经验，但大多是坐车的人晕，开车的驾驶反而不会不适，同样都坐在车上，为什么会有这种分别？

晕车、晕船、晕机造成的头晕、头痛、恶心、呕吐等现象，医学上称之为晕动症。对于单纯的晕动症，一般认为是人体内耳平衡器官——前庭器官所致。前庭器官过分敏感或发育不全，会引起自主神经系统功能紊乱，晕动症就出现了。

自主神经系统分为交感神经和副交感神经，两者相互抑制，就像两个坐跷跷板的兄弟，当交感神经兴奋时，副交感神经就会被抑制住，反之亦然。

晕车时人体表现为“副交感神经兴奋，交感神经抑制”，而副交感神经的主要功能是使瞳孔缩小、心跳减慢，皮肤和内脏血管舒张、胃肠蠕动加强、唾液分泌增多等。这也解释了晕车时为何会出现恶心、呕吐、胸闷、发汗等症状。

开车时却不一样，人体处在“交感神经兴奋，副交感神经抑制”的状态，因此不会出现上述那些症状，也就不会晕车。