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Fever works as an alarm that some infection (whether by virus or bacteria) is attacking the body. It gives the signal to accelerate the production of antibodies that will fight the disease and it is this more intense activity in our organism that increases its temperature. The feeling of cold occurs because the body begins to lose heat very quickly, as the blood vessels in the skin dilate, radiating more heat to the outside. “In addition, as human beings have a balanced temperature with that of the environment (about 37ºC), when warming up, the person will feel the environment colder. Therefore, although the body is hot, the external temperature will seem relatively lower”, says neurologist Paulo Monzillo, from Hospital Albert Einstein, in São Paulo. Another factor that contributes to reinforce the feeling of cold is the increase in perspiration, which, when evaporating on the skin, also has the function of cooling the body.