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nausea
Nausea (Latin ''nausea'', from Greek - ''nausia'',〔(ναυσία ), Henry George Liddell, Robert Scott,.''A Greek-English Lexicon'', on Perseus〕 "ναυτία" - ''nautia'', motion sickness", "feeling sick or queasy"〔(ναυτία ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕) is a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit.〔 It occasionally precedes vomiting. A person can suffer nausea without vomiting. (Greek ναῦς - ''naus'', "ship"; ναυσία started as meaning "seasickness".) When prolonged, it is a debilitating symptom.
Nausea is a non-specific symptom, which means that it has many possible causes. Some common causes of nausea are motion sickness, dizziness, migraine, fainting, gastroenteritis (stomach infection) or food poisoning. Nausea is a side effect of many medications including chemotherapy, nauseants or morning sickness in early pregnancy. Nausea may also be caused by anxiety, disgust and depression.〔(【引用サイトリンク】title=Stress symptoms: Effects on your body, feelings and behavior )〕〔(【引用サイトリンク】title=Diagnostic Criteria: Clinical Guidelines for the Management of Anxiety )〕〔(【引用サイトリンク】title=Disease Information for Stress/Emotional/Physical: Clinical Manifestations )〕
Medications taken to prevent and treat nausea are called antiemetics. The most commonly prescribed antiemetics in the US are promethazine, metoclopramide and ondansetron.
==Causes==
There are many causes of nausea. One organization listed 700 in 2009.〔(【引用サイトリンク】title=Differential Diagnosis for Nausea )〕 Gastrointestinal infections (37%) and food poisoning are the two most common causes.〔 Side effects from medications (3%) and pregnancy are also relatively frequent.〔〔 In 10% of people the cause remains unknown.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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