Influenza, commonly known as the flu, is a contagious viral infection that affects the nose, throat, and lungs. It spreads easily through droplets when infected individuals cough, sneeze, or talk. Symptoms of influenza include fever, sore throat, cough, body aches, fatigue, and chills. Early detection and treatment are crucial to prevent complications, especially in children, the elderly, and people with weakened immune systems. Learn about influenza prevention, symptoms, and vaccination to stay protected year-round.