I was wondering if its ok to say something like “The fever is cooling down” or the “Fever is getting better”

I thought the second one could be more likely to be correct. But then I doubt it because it might sound like the fever is getting better (stronger) but the person not. So I dont really know what to say about a fever, a headache a flu, and stuff like that.


How about these?
The fever is dropping.
The fever is diminishing.
The fever is lessening.
His temperature is returning to normal.