Dealing with Fever

Fever is a physiological response characterized by an increase in body temperature, typically above 100.4°F (38°C). It is primarily triggered by the immune system in response to infections (viral or bacterial), inflammation, or other stimuli like certain medications or heat exposure. Viruses are, by far, the most common cause of fever. Studies suggest that young children will have as many as 12 viral infections over the course of a year. The hypothalamus, a part of the brain that regulates body temperature, raises the set point in response to pyrogens (substances that induce fever), which can be either endogenous (produced by the body) or exogenous (from outside the body).

While fever itself is generally not dangerous, it can be a sign of an underlying condition that may require attention. Mild to moderate fevers (up to about 102°F or 39°C) are typically not harmful and may even aid the immune response by creating an environment less favorable for viruses and bacteria. However, high fevers (generally above 104°F or 40°C) can lead to complications such as dehydration. Fevers can be more concerning in certain populations, particularly young infants and people with compromised immune systems.

Treatment of fever should be based on the underlying cause and patient comfort. As anyone who has had the flu can report, fevers are uncomfortable! Evidence-based medicine suggests that antipyretics, such as acetaminophen or ibuprofen, can be used to reduce fever and alleviate discomfort. An effort to drink lots of fluids can help prevent dehydration from fever. In children, it is important to monitor for signs of serious illness, and if a fever persists for more than a few days or is accompanied by other concerning symptoms (e.g., difficulty breathing, severe headache, rash), please seek medical attention.

In summary, while fever is a natural and often beneficial response to infection, understanding when it is appropriate to treat it and how to do so safely is crucial for effective management.