The heating process, due to the heat and thermal changing this to contradictory, so heat can be divided into four phases:
(1) the prodromal period: many febrile diseases without this period symptoms. This period of duration of symptoms, varies depending on febrile disease situation, mainly: General discomfort, malaise, fatigue, low back and limb pain, headache, anorexia, mental instability, low heat; some exanthematous diseases, in front of the whole body rash appears can be prodromal eruption, such as measles precursors at the time of Caterina Fake\'s spot oral mucosa may occur.
(2) an increase in body temperature period: this period is characterized by less heat generation and heat sink, so heat production advantage, so the temperature rises. Pyrogen changed after entering the body thermoregulation excitability of the central nervous system, skin vasoconstriction, perspiration reduce, while due to metabolism enhancing, and feeling cold, and reflex caused vertical muscle contraction, formation chills and muscle contraction will cause Thermogenesis increase. Clinically manifested as skin pale, dry, no sweat, \"goose bumps\", touch the skin of children with a sense of cold; such as shivering occurs, indicating high fever will occur. Child care in this case, convulsions may occur. During the chills, body temperature 38 ℃ above, and most within a few hours to achieve very high fever, such as malaria, pneumonia, sepsis, drug reactions such as fever, as a sudden rise in body temperature above. Temperature rise, for low heat in the early days of fever, rising gradually from low heat reached within a few days of high fever, called a gradually rising fever. Gradually rising very prodrome, most non-shivering, but sometimes may feel cold, such as atypical of typhoid fever. Some sudden upsurge of fever, caused by this may begin to low heat is ignored. In addition, brucellosis, tuberculosis and other diseases of the body temperature is gradually rising fever.
(3) the duration of high temperature: the temperature has reached its peak at this time, this period is characterized by enhanced thermal process begins, thermoregulation constantly strengthen the regulation of the central nervous system. Due to the enhanced thermal process begins, the patient surface skin blood vessels to dilate, breathing strengthened, begin to sweat, no longer continued to rise in body temperature. But because the body is still heating substances constantly stimulated, heat production is not reduced, so this period producing heat and cooling of the newly re-established on the basis of the relative balance to maintain body temperature at a certain level. Clinically manifested as skin flushing and hot reinforcement, sweating, breathing speed up such, sustainable hours of this period of high fever (malaria) or days (such as pneumonia), even more than a few weeks (such as typhoid fever).
(4) body temperature drop period: this period is the end of the heat. It is characterized by thermal process of the dominant, and body temperature return to normal. Due to the body\'s defense or take proper treatment, pyrogen in vivo effects gradually disappear or decrease, heat production reduced, at the same time through the thermoregulation of Central regulation, heat sink is still at a high level, the patient surface skin blood vessels to dilate, profuse sweating, heat strengthening and body temperature began to fall, producing heat and thermal finally return to normal state of relative balance. Body temperature dropped way is generally getting back, that is, in a few days gradually returned to normal body temperature (such as typhoid); also a crisis of, that is, body temperature in a dozen drops to normal within hours or a shorter period of time, or less than normal (such as Lobar pneumonia). Drop in body temperature, because a lot of sweating, loss of large amounts of body fluids, so for the patients with high fever in children in the use of antipyretic drugs, must carefully to prevent causing exhaustion and other complications
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