Flu Disease Symptoms : Flu, or influenza, is a contagious respiratory illness caused by influenza viruses. Common symptoms include a sudden high fever, chills, body aches, fatigue, sore throat, cough, and headaches. Some people may also experience a runny or stuffy nose, and in some cases, nausea or diarrhea. Symptoms can range from mild to severe, and the flu can sometimes lead to serious complications, especially in vulnerable populations like the elderly, young children, and those with weakened immune systems.flu disease symptoms

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