頭暈 Dizziness

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頭暈 Dizziness

　　Dizziness

　　頭暈

　　Dizziness is a general term that describes sensations of imbalance and unsteadiness, such as vertigo, syncope, mild turning, and imbalance. Feelings of dizziness stem from the vestibular system, which includes the brain and the parts of the inner ear that sense position and motion, coupled with sensory information from the eyes, skin, and muscle tension. Each category has a characteristic set of symptoms, all related to the sense of balance. In general, syncope is defined by a brief loss of consciousness (fainting) or by dimmed vision and feeling uncoordinated, confused, and lightheaded. Many people experience a sensation like syncope when they stand up too fast. Vertigo is the feeling that either the individual or the surroundings are spinning. This sensation is like being on a spinning amusement park ride. form www.med66.com

　　頭暈是用以描述失去平衡或不穩(wěn)定感覺的一個(gè)概括性術(shù)語,包括眩暈、暈厥、輕微的旋轉(zhuǎn)、失去平衡等。頭暈的感覺來自于迷路系統(tǒng)，包括大腦和感受位置及運(yùn)動(dòng)的內(nèi)耳部分組織，與來自眼睛、皮膚和肌張力的感覺信息密切相關(guān)。各種表現(xiàn)都有特定的癥狀，但都與平衡感有關(guān)。一般說來，暈厥的定義是意識(shí)的短暫?jiǎn)适?暈倒)或兩眼發(fā)黑，感到共濟(jì)失調(diào)、意識(shí)迷糊或頭昏眼花。很多人在站起過快時(shí)會(huì)產(chǎn)生這種暈厥感。眩暈是本人或?qū)χ車h(huán)境的旋轉(zhuǎn)感。其感覺就象是在公園乘坐過山車。