The flu (influenza) typically begins with sudden symptoms such as fever, chills, body aches, and fatigue. Individuals often experience a sore throat, dry cough, and a runny or congested nose. Headaches and muscle pain are common, and some people may have gastrointestinal symptoms like nausea or vomiting, though this is more common in children. The flu can make you feel extremely tired and weak, sometimes lasting several days to over a week. Unlike the common cold, flu symptoms tend to come on quickly and are more severe. It’s important to rest, stay hydrated, and seek medical attention if symptoms worsen or if complications arise.