why does your body get achy when you are sick?
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Part of the inflammation reaction to an infection is to release cortisol, also known as the stress hormone.
That hormone does a lot of things, but one of them is to make you feel icky and sore.
The primary reason that it’s released is more likely to be the other stuff that it does. But the fact that it makes you actually rest when you’re sick and also reduces the chances you’ll go out of your cave and infect the rest of the tribe probably did help the trait be selected for by natural selection.
So it’s a feature, not a bug. People and tribes that got sore and achy when they were sick did better in the long run than groups where they stayed happy and chipper.
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