Eli5 please: I woke up with a little stomach bug, so why does my whole body ache? Why are the fingers and toes aching when the stomach is sick? How does that work?
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5 year-old answer: your whole body is revving up to kill the bug. (its your immune system intiating a ton of chemical responses to kill the bug, and that will have effects on your whole body, as well-explained by others)
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