发热

发热体温高于正常水平的升高，经口测量人体体温约为98°C(37°C)。发烧被认为是一种疾病的症状，而不是疾病本身。正常情况下，人体燃烧食物所产生的热量通过排汗和呼吸等过程散发出去。据信，传染病、身体组织损伤和其他引起炎症的情况会导致前列腺素(一种激素)的释放，这种激素与下丘脑的部位结合，下丘脑是身体温度控制的中心。由此引发的体温上升是身体抵御感染的一部分;白细胞变得更加活跃，而大多数细菌也不那么活跃了。发烧对身体的影响是虚弱、疲惫，有时还会因出汗过多而导致体液耗竭。极高热可引起惊厥反应并最终死亡。除了传染性疾病(如肺炎和扁桃体炎)，脑部疾病、某些类型的癌症和严重的中暑也可能引起发烧。也有发热的病例，病因无法查明。 Treatment includes increasing the intake of fluids and administering aspirin and other fever-reducing medications. Aspirin may be dangerous in fevers of children because of Reye's syndrome. However, primary treatment is directed at the underlying cause unless the fever is very high (above 104°C/40°C). Persons with such dangerously high fevers are sometimes sponged with cool water or immersed in cool baths.

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