名詞 noun 発音記号 fiː.vɚ

a medical condition in which the body temperature is higher than usual:

He's got a headache and a slight fever.
The disease causes coughing, chest pain, and fever.

※slight　わずかな

https://dictionary.cambridge.org/ja/dictionary/english/fever

Do you have a fever?
熱ありますか？
I have a fever.
熱がある。

日本語だとフィーバーは興奮の意味が第一だけど、英語だと熱の方が一位なのかな。