space adaptation syndrome

space adaptation syndrome
a form of motion sickness occurring in a weightless environment during space flight, with nausea, vomiting, anorexia, headache, malaise, drowsiness, and lethargy. It is probably caused by conflicting signals concerning motion from the otolith (whose proper function depends on the presence of gravity) and the visual system (which affects the autonomic nervous system). Called also space sickness.

Medical dictionary. 2011.

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