My 17 Year Old Son, Is Congested, Has Low Energy,

My 17 year old son, is congested, has low energy, and has a sore throat. He came home from staying in a hotel for a golf tournament and had these symptoms. He's not running a temperature. He's not coughing. No one else is sick. I don't feel like this is just a cold and the flu season has been around our house in February.