The flu, or influenza, is a contagious respiratory illness caused by the influenza virus. Early detection of flu symptoms is crucial for effective treatment and preventing the spread to others. The first signs of the flu often appear suddenly, including fatigue, fever, chills, body aches, and a dry cough. Many individuals may also experience a sore throat, runny or congested nose, and headaches as the illness progresses. Recognizing these initial symptoms can help differentiate the ...
