Describe a common symptom of the flu.
A common symptom of the flu is a high fever, usually above 100.4°F (38°C). The fever is often accompanied by chills, sweating, and a general feeling of being unwell. It is the body's natural response to fight off the infection and can last for several days.
Complete the following task based on the instruction and optional input provided.### Instruction:
Describe a common symptom of the flu.

### Output:
A common symptom of the flu is a high fever, usually above 100.4°F (38°C). The fever is often accompanied by chills, sweating, and a general feeling of being unwell. It is the body's natural response to fight off the infection and can last for several days.