When the fever rises, many households repeat the same ritual: wet cloths, cold showers or even ice baths, in the hope that the thermometer will drop as soon as possible. It is one of the most deeply rooted popular beliefs in health care, transmitted from generation to generation. However, current medical evidence agrees on something that surprises many: bathing with cold water is not only not the best way to reduce fever, but it can be counterproductive.

To understand why this practice doesn't work as you think, you first have to understand what happens in the body during a feverish episode.

Fever is not a disease in itself, but rather a natural response of the immune system to an infection or other inflammatory process. The hypothalamus, a region of the brain that acts as the body's “thermostat,” deliberately raises the body's reference temperature to create an environment more hostile to viruses and bacteria, and to enhance the activity of defense cells.

That is to say: when there is a fever, the body wants to be warmer. This is not a failure of the thermal regulation system, but rather an active decision by the body.

The cold water problem

This is where the conflict with the cold water bath arises. By immersing a febrile person in cold water, the skin cools rapidly, but the hypothalamus remains “programmed” to maintain a higher internal temperature.

The result is that the body interprets the external cold as a threat and reacts in a way opposite to what is desired:

In other words: cold-water bathing can end up raising your internal body temperature instead of lowering it, as well as creating unnecessary physical stress just when your body is already fighting an infection.

What to do then?

The clinical guidelines of pediatric and internal medicine societies agree on several points:

A myth with good intentions, but...

As with many traditional care practices, the cold-water bath is based on intuitive logic—if the body is hot, the cold water should cool it—that does not take into account the complexity of human thermal regulation. Specialists insist that the goal should not be to “attack” the fever at all costs, but rather to accompany the body in its natural defense process, relieving discomfort without generating adverse reactions.

Dispelling this myth is not an academic whim: in cases of high fever in babies or vulnerable people, applying cold water can delay appropriate care or generate avoidable complications.

The recommendation is clear and agrees in the medical community: in the face of fever, calm, hydration, warm measures and, if necessary, appropriate medication, saving cold water for the refreshment of a summer afternoon, not for the bedside table of a sick person.