system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the flu make your joints and muscles hurt? Shouldn't it just cause a fever and make you feel tired as your body dukes it out.

Explained!! Thank you very much!
gpt
The flu is a viral infection, which your body battles with its immune system, composed of white blood cells (WBCs). Your WBCs are stationed somewhat regularly throughout your body, including in your joints and muscles where they somewhat oversee daily minor repair to those regions. When you get the flu, the WBCs are summoned to battle the infection, neglecting their regular duties and leaving some of your minor daily wear-and-tear in your muscles and joints unattended, causing your achiness and discomfort. This is temporary, until the infection is defeated and regular maintenance can be resumed.