Fever is generally classified as low fever 37.2℃-38℃, moderate fever 38.1-39℃, high fever 39.1-41℃, and over 41℃ is called ultra-high fever. In general, most fevers in the general population are more low fever or moderate fever and less high fever. Some patients may have hyperthermia if combined with bacterial infections; viral infections may also have hyperthermia, but it is relatively rare. Hyperthermia is usually not considered to be caused by infection, but is usually caused by poisoning, heat stroke, or drug fever. In general, the temperature of patients with hyperthermia is not measured by the thermometer. In fact, it is not measured well, or not accurate, or some people say that the fever is 45 ℃, that is not possible, the temperature table is at most 41 ℃, will not exceed 45 ℃, may not be accurate. If the thermometer can not measure, certainly do not consider the general viral and bacterial infection. Consider whether it is caused by heatstroke, medication or central fever, so it is best to see a doctor to tell him or her exactly how many degrees the temperature has not been measured. It is best to go to the hospital and measure the patient again, more reassuring and accurate.