Likely because the intense vomiting and nausea sufferers experience is caused by the shift in environment astronauts are experiencing. This causes space adaptation syndrome (SAS), a common illness that's kind of like seasickness in space. It is the opposite of terrestrial motion sickness since it occurs when the environment and the person appear visually to be in motion … Centrifuging astronauts for a lengthy period provided researcher Suzanne Nooij with better insight into how space sickness develops, the nausea and disorientation experienced by many astronauts. Motion sickness, the most frequently reported ailment, is a subset of SAS; it … Humans rely on the vestibular system for balance and attitude, and with the lack of gravity the fluids don't move correctly. The low gravity in space allows astronauts to float around, which looks very fun, but it can help cause space sickness. Space adaptation syndrome (SAS) or space sickness is a condition experienced by as many as half of all space travelers during their adaptation to weightlessness once in orbit. Some astronauts who show an exceptional tolerance to motion sickness when flying jets suffer the worst symptoms upon arriving in space. Space motion sickness happens in the first 48 hours, creating a loss of appetite, dizziness and vomiting. Promethazine-containing drugs emerged as the best choice during the early 1990s, and … National Space Biomedical Research Institute, established in 1997, is working to help with causes and effects of the space motion sickness … PHOTO: NASA Related Article The Kelly twins: Revealing the secrets of the human body in space "This occurs on Earth as well," adds Schneider. to minimize the symptoms of space motion sickness. Without gravity's cues, in other words, many astronauts feel sick when they first arrive in orbit. Space sickness is nausea and disorientation felt by many astronauts. To understand how astronauts deal with space … Image Credits: Dizziness and Balance. For some astronauts, drugs are used to reduce the symptoms. Your question has bits that are correct. To answer your question, Yes, almost everyone has motion sickness in zero gravity. Space sickness if formally known as ‘Space Adaptation Syndrome’. The space motion sickness becomes a hurdle for astronauts to perform their job in space. "For example, gymnasts who perform acrobatics and do not get motion sick may get sick … But they do … Motion sickness caused when both systems detect motion but they do not correspond, as in either terrestrial or space motion sickness. But motion sickness tends to fade as the mission continues, allowing astronauts to somersault …