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Dizziness is an impairment in spatial perception and stability. Because the term ''dizziness'' is imprecise, it can refer to vertigo, presyncope, disequilibrium, or a non-specific feeling such as giddiness or foolishness. One can induce dizziness by engaging in disorientating activities such as spinning. * Vertigo is the sensation of spinning or having one's surroundings spin about them. Many people find vertigo very disturbing and often report associated nausea and vomiting. It represents about 25% of cases of occurrences of dizziness.〔 * Disequilibrium is the sensation of being off balance, and is most often characterized by frequent falls in a specific direction. This condition is not often associated with nausea or vomiting. * Presyncope is lightheadedness, muscular weakness and feeling faint as opposed to a syncope, which is actually fainting. * Non-specific dizziness is often psychiatric in origin. It is a diagnosis of exclusion and can sometimes be brought about by hyperventilation.〔 A stroke is the cause of isolated dizziness in 0.7% of people who present to the emergency room.〔 ==Classification== Dizziness is broken down into 4 main subtypes: vertigo (~50%), disequilibrium (less than ~15%), presyncope (less than ~15%) and lightheadedness (~10%).〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dizziness」の詳細全文を読む スポンサード リンク
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