1. Inflammation caused by the virus
When a virus such as the flu virus enters the body, it activates the immune system. This response can trigger inflammation, contributing to widespread muscle pain.
2. Fever and dehydration
A fever, which is common with the flu, can increase fluid loss, leading to muscle cramps and discomfort associated with dehydration.
3. General fatigue
The flu can take a toll on the body, leaving you feeling exhausted. Tired muscles can make muscle soreness feel more pronounced.

