system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly is happening in your body to make your body ache all over when you have the flu?
gpt
Inflammation!

To keep it simple, when you’re sick your body will flood itself with white blood cells. That along with increased blood flow and the typical fever result in aches and pain in your joints and muscles.

You’re essentially inflamed all over.