When Should You Be Worried About a Fever?

28. Oktober 2025

2 Min. Lesezeit

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A fever is a frequent phenomenon that signals a problem in the body. Some people prefer to let the immune system fight it, while others begin to worry after even a slight increase in temperature. What should you know about fevers and rising temperatures?

Wichtigste Erkenntnisse

A fever is a frequent phenomenon that signals a problem in the body.
What is the norm?
When should you try to reduce your temperature?

Für wen das ist

Für alle, die Bakterielle und virale Infektionen über fever, cold erkunden.

Warum es wichtig ist

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Artikelautor

Dr. Helga

Allgemeinmedizinerin

What is the norm?

There is no universal answer to this question. 98.6 degrees Fahrenheit is often cited as an indicator of normal body temperature. For some, their normal temperature is 97 degrees, while for others it is 99 degrees. The same is true about the temperature rise: many people fell ill at 99 degrees, while others remain active and feel normal up to 101 degrees.

For the last 170 years, a temperature of 98.6 degrees has generally been considered normal. At that time, Carl Wunderlich, a general practitioner from Germany, conducted a clinical study and found that for 82 % of the subjects, the optimal temperature was 98.4 to 98.6 degrees Fahrenheit.

When should you try to reduce your temperature?

You should take note when your body temperature hits 102 degrees or higher. In this case, the load on the heart and blood vessels increases, blood pressure rises, and you begin sweating and rapidly losing fluid.

Everything else is just a concern for your well-being, but you should not write it off. If at 99.5 degrees you feel like lying flat, are losing appetite, feel physically ill, are having trouble concentrating, or have chills or fever, you should try to bring your temperature down.

If your body temperature is higher, say at 100.4 degrees, but you are functioning well, in a good mood, and only have a little discomfort, avoid trying to medicate the fever away. In this case, the body may take care of it on its own Trying to bring down the temperature only means interfering with the immune system.

Special case

Those who have already been vaccinated against COVID-19 know that a frequent reaction to the vaccination is a temperature increase for 1–2 days, and for many people, it is quite significant.

The natural question is whether taking anti-fever medications will interfere with the production of antibodies. There have been no studies conclusively confirming or refuting whether this is true.

Therefore, after vaccination, most doctors recommend following the traditional advice: take a fever medication if it causes significant discomfort, and do not interfere if the temperature is easily tolerated

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