Editing Sense of balance (section)

==Dysfunction==
{{Main|Balance disorder}}
[[File:Balance Disorder Illustration C.png|thumb|left|This figure shows nerve activity associated with rotational-induced [[physiologic nystagmus]] and spontaneous nystagmus resulting from a lesion of one labyrinth. Thin straight arrows show direction of slow components, thick straight arrows show direction of fast components, and curved arrows show direction of [[endolymph]] flow in the horizontal [[semicircular canals]]. The three semicircular canals are marked AC (anterior canal), PC (posterior canal), and HC (horizontal canal).]]When the sense of balance is interrupted it causes [[dizziness]], [[Orientation (mental)|disorientation]] and [[nausea]]. Balance can be upset by [[Ménière's disease]], [[superior canal dehiscence syndrome]], an [[inner ear infection]], by a bad [[common cold]] affecting the head or a number of other medical conditions including but not limited to [[vertigo]]. It can also be temporarily disturbed by quick or prolonged [[acceleration]], for example, riding on a [[merry-go-round]]. Blows can also affect equilibrioreception, especially those to the side of the head or directly to the ear.

Most [[astronaut]]s find that their sense of balance is impaired when in orbit because they are in a constant state of [[weightlessness]]. This causes a form of [[motion sickness]] called [[space adaptation syndrome]].