No, the body temperature stays around 37 degrees Celsius.

Scientists don't have a definitive answer about the phenomenon of constant body temperature, but one hypothesis suggests that the brain operates optimally at a constant temperature, so that in the long run of natural selection, thermostable animals are selected down.

Of course, lower animals with simple brains are selected for survival methods that are different but are the most favorable environment for them. For us humans, constant temperature is the best choice.

The fact that the brain maintains a constant temperature is not the only reason why thermostats maintain a constant temperature. Chemical reactions generally speed up when the temperature rises, so making the body a thermostat at a higher temperature promotes activity to some extent.

But there is a limit to this reaction, and when too much heat can't be expelled and information comes in too fast, the system can disintegrate. Over the past few million years, humans, as well as other mammals and birds, seem to have discovered that the optimum temperature is around 37 degrees Celsius.

Extended information:

The 37 degrees Celsius is just an approximate figure for body temperature, for all parts of the body, There are differences in body temperature between the morning and evening of each day and between men and women. A normal person's oral temperature is 36.3 ℃ ~ 37.2 ℃, the armpit temperature is lower than the oral temperature of 0.3 ℃ ~ 0.6 ℃. 3℃～0.6℃, rectal temperature is 0.3℃～0.5℃ higher than the oral temperature.

Throughout the day, the body temperature is lowest in the early morning from 2 to 5, and highest in the afternoon from 5 to 7. In addition, women's body temperature is generally higher than men's about 0.3 ℃, women's body temperature in the menstrual period also has a slight change.

To maintain a constant body temperature, it is necessary to choose a point where heat production and heat dissipation are most easily balanced. At this temperature, the heat generated by the body's activities is most easily balanced with the heat lost to the environment, making it easiest to maintain a constant body temperature.

Scientists believe that human body temperature is set at 37 degrees Celsius for the same reason we feel comfortable in a room at 27 degrees Celsius. When humans appeared in Africa more than two million years ago, the average daytime temperature was below 25C.

This climate made it easiest to dissipate the heat generated through metabolic processes by activities like hunting when human body temperatures were above 35°C.

People's Daily Online - Mystery of Body Temperature: Why Human Body Temperature is 37℃