Flu, or influenza, is a respiratory illness caused by the influenza virus. Symptoms can range from mild to severe and may include:

1. Fever: A high temperature is a common symptom of the flu, usually above 100.4°F (38°C).
2. Chills: Feeling cold or shivering even when you're not in a cold environment.
3. Muscle or body aches: Flu often causes aching muscles, especially in the back, arms, and legs.
4. Headache: Moderate to severe headaches are common with the flu.
5. Fatigue: Feeling weak, tired, or exhausted is a typical symptom of the flu.
6. Cough: A dry, persistent cough is often present with the flu.
7. Sore throat: An irritated or painful throat is another symptom of the flu.
8. Runny or stuffy nose: Nasal congestion or a runny nose can occur with the flu.
9. Loss of appetite: Decreased appetite or not feeling hungry is common during a flu infection.

In some cases, people may also experience vomiting and diarrhea, although these symptoms are more common in children than adults.

It's important to note that flu symptoms can be similar to those of other respiratory infections, including COVID-19. If you're experiencing any of these symptoms, it's essential to consult a healthcare professional for proper diagnosis and treatment.

Always remember that I'm an AI language model, and while I strive to provide accurate information, it's essential to consult a healthcare professional for medical advice.
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