Space motion sickness may be explained in terms of vestibular problems, fluid shift and raised intra-cranial pressure(ICP). The latter is known to trigger nausea, vomiting and headache in pateints who have a defect in the drainage of cerebrospinal fluid. Different non-invasive as well as invasive techniques have been used in space to test this hypothesis. Solving the problem will enable astronauts aboard the International Space Station to be more effective.
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