Just as<unk>  sickness has the opposite cause compared to terrestrial motion sickness, the two conditions have opposite non-medicinal remedies. The idea of sensory conflict implies that the most direct remedy for motion sickness in general is to resolve the conflict by re-synchronizing what one sees and what one feels. For most (but not all) kinds of terrestrial motion sickness, that can be achieved by viewing one's surroundings from a window or (in the case of seasickness) going up on deck to observe the seas. For<unk>  sickness, relief is available via the opposite move of restricting one's vision to a small area such as a book or a small screen, disregarding the overall surroundings until the<unk>  process is complete, or simply to close one's eyes until the nauseated feeling is reduced in intensity during the adjustment period. Some research indicates that blindness itself does not provide relief; "Motion sickness can occur during exposure to physical motion, visual motion, and virtual motion, and only those without a functioning vestibular system are fully immune. As with sea sickness and car sickness,<unk>  motion sickness symptoms can vary from mild nausea and disorientation to vomiting and intense discomfort; headaches and nausea are often reported in varying degrees. The most extreme reaction yet recorded was that felt by Senator Jake Garn in 1985 on<unk>  shuttle flight STS-51-D. NASA later jokingly began using the informal "Garn scale" to measure reactions to<unk>  sickness. In most cases, symptoms last from 2–4 days. When asked about the origins of "Garn", Robert E. Stevenson said: Garn's purpose on the mission was in part to subject him to experiments on<unk>  motion sickness. Predicting whether someone will experience<unk>  sickness is not possible. Someone who suffers from car sickness may not suffer from<unk>  sickness, and vice versa. In excellent physical condition, Garn did not become sick on the vomit comet before STS-51-D. All three astronauts on Skylab 3 suffered from nausea, although the three on Skylab 2 had not; the illness affected their work during the first few days, worrying NASA doctors. Experienced aviators and<unk>  travelers can suffer from<unk>  sickness. Garn began piloting at the age of 16 and piloted a variety of military aircraft for 17,000 hours—more than any NASA astronaut—before STS-51-D. Charles D. Walker became ill on the same flight despite having flown on the shuttle before. While the Skylab 3 crew quickly recovered—whether by eating six smaller meals instead of three larger ones, or just by becoming used to<unk> —one of the Skylab 4 crew became sick despite anti-nausea medication. Steven Smith estimated that on four shuttle flights he threw up 100 times.<unk>  sickness that occurs during<unk>  flight can also continue for days after landing, until the vestibular system has again adapted to gravity.
Space adaptation syndrome
Foreign accent syndrome
Serotonin syndrome
Cannabinoid hyperemesis syndrome
Adrenergic storm
Vasoplegic syndrome
Cholinergic crisis
Monofixation syndrome