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There is no evidence that this actually happens. It turns out that, with or without fever, the body’s temperature fluctuates naturally and, in the late afternoon, it is customary to notice an increase in this temperature – but science has not yet discovered why. “One hypothesis is that the muscle contractions exerted during the day keep our body warmer, reaching a higher temperature at dusk. The state of muscle relaxation in which we wake up in the morning would have the opposite effect”, says general practitioner Zyun Masuda, from São Paulo. If the person has a fever, another factor may help increase it. “There is a possibility that this is due to a natural drop in the action of cortisone. This hormone is released in the early hours of the morning and helps us stay active during the day. But, over time, the organism slows down and, with that, the fever can rise”, says another general practitioner, Arnaldo Litchenstein, from the Hospital das Clínicas in São Paulo.
In addition, when night comes, the day-to-day stimuli decrease, making room for the person to feel more intensely not only the heat of the fever, but also the other symptoms that may accompany it, such as pain and malaise. . “There are, yes, specific diseases that cause intense fever at dusk, such as tuberculosis, but we still don’t have an explanation for that. Inflammation causes a high fever all day long,” says Arnaldo.