Dizziness

　　头晕

　　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

　　头晕是用以描述失去平衡或不稳定感觉的一个概括性术语,包括眩晕、晕厥、轻微的旋转、失去平衡等。头晕的感觉来自于迷路系统，包括大脑和感受位置及运动的内耳部分组织，与来自眼睛、皮肤和肌张力的感觉信息密切相关。各种表现都有特定的症状，但都与平衡感有关。一般说来，晕厥的定义是意识的短暂丧失(晕倒)或两眼发黑，感到共济失调、意识迷糊或头昏眼花。很多人在站起过快时会产生这种晕厥感。眩晕是本人或对周围环境的旋转感。其感觉就象是在公园乘坐过山车。