Excerpt from this article:
Tech evangelists predicted that 2016 would be “the year of virtual reality.” And in some ways they were right. Several virtual reality headsets finally hit the commercial market, and millions of people bought one. But as people begin immersing themselves in new realities, a growing number of worrisome reports have surfaced: VR systems can make some users sick.
Scientists are just beginning to confirm that these new headsets do indeed cause a form of motion sickness dubbed VR sickness.