With a temperature you will feel warm and probably thirsty. It shouldn't
cause flu-like symptoms (except feeling warm and thirsty).

When you are overheated from being outside and active, you feel warm, not
cold (shivering).

When you are sick and feel cold (shivering), what I think happens is that
your body has a thermostat (in the part of the brain called the
hypothalamus). The set point of the thermostat goes up in response whatever
was causing this (probably a virus or a bacterium or some other infection or
inflammation). When your set point goes up, your temperature is below the
set point and you feel cold and start to shiver. (So if your temperature is
102 and your hypothamalus is saying it is supposed to be 103, you will still
feel cold.)

So if you feel cold and have a temperature of 102, there is something going
on that is not related to excercise or being too warm.

Jeff

Actually, the average body temperature is around 98.2 F. What happened is
that the original temperature measurements where metric with an average temp
of 36.8 C. This got rounded up to 37 C and then converted  to 98.6 F. 98.6
is the temp that stuck as normal ever since.

I think the idea of calling a particular temperature a fever isn't to say
that the temperature is above normal, but rather, it is clinically
significant or something that you should really pay attention to. In other
words, if you have a temperature of 100 and feel pretty much ok, you will
get over it  without any problem. When the temperature gets higher, then you
more likely have a problem. So 100.4 or 101 or whatever is really a cutoff
based on clinical experience as a temperature that is more likely to
indicative of something that can be serious.

Of course, a fever is not an illness, but a symptom. You have to take all
the signs and symptoms together. If you have a cough, your lungs sound
really bad, you are shivering, you have difficulty breathing and a temp of
105, one would think about pneumonia or another serious infection. If  you
have a temp of 101, are dehydrated, and feel really warm and sweaty, one
would think that you are too hot, perhaps because you were just cutting the
grass. Getting fluids, getting into the shade or air conditioning are key.

Jeff