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发热是一个基本病理过程,同时它又是最常见的临床症状之一。一般说体温超过正常0.5℃即是发热,但必须与一过性体温升高区别开来,后者可见于剧烈活动、癫痫发作等。一过性体温升高由于没有体温调节中枢调定点上移,本质上不属于发热。发热从本质上看是由于致热原或其它原因引起的体温调节中枢调定点上移而导致的一种新的高水平的体温调节活动。根据体温升高的程度,分为低热(38℃以下)、中等热(38～39℃)、高热(39℃以上)或过高热(41℃以上)。
Fever is a basic pathological process, and at the same time it is one of the most common clinical symptoms. Generally speaking, the body temperature exceeds normal 0.5 ℃ that is fever, but must be distinguished from a transient increase in body temperature, the latter can be seen in violent activities, seizures and so on. A transient increase in body temperature because there is no regulation of central heating point up, in essence, does not belong to fever. Fever is essentially a new, high level of thermoregulatory activity that results from a shift in the set point of the thermoregulatory center caused by pyrogen or other causes. According to the degree of body temperature increases, divided into low heat (38 ℃ below), moderate heat (38 ~ 39 ℃), high fever (39 ℃ above) or overheating (41 ℃ above).