I have seen this question where the author is asking why people take drugs for fever. So my question is: Is fever is a disease or not?
I know pretty much nothing in medicine!
Fever is an abnormally high body temperature. Fever is a symptom and not a disease per se. Different medical conditions (incl. various infectious diseases) causes a patient to have fever.
Note that fever might be in some/most situations an adaptive response to a disease. In other words, for infectious disease causing fever, fever might be good for the host and not for the parasite. However this issue remains controversial (see the post linked in the OP's question for more info).
As GoodGravy said in the comments, many people get confused and consider fever as a disease instead of what it really is; a symptom. One likely reason for this confusion is that when one has fever, (s)he very often treat fever directly (taking drugs like Aspirin for example) rather than treating the underlying cause (the virus for example) of the fever.
Any malfunctioning in the body is the result of either external pathogens, environmental changes or it can be manifested by the body itself. Based on which we can call it a disease or a disorder.
Some can be viewed with the help of its underlying symptoms. Fever is a natural response of the human body to any kind of imbalance, for example, temperature fluctuations, infections, etc., and that is why we can get fever by any number of reasons. What is important is that it shows us of some other underlying reason of change. Therefore I think it's more of a symptom than a disease.