Common illnesses like the flu and the common cold share some similar signs and symptoms, making it i

The flu, caused by the influenza virus, typically presents with sudden onset symptoms such as high fever, chills, body aches, fatigue, and a dry cough. Some individuals may also experience a sore throat, nasal congestion, and headaches. In severe cases, complications like pneumonia can occur, especially in high-risk groups such as young children, elderly adults, and individuals with weakened immune systems.