Flu can be an unpleasant illness causing fever, stuffy nose, dry cough, sore throat, aching muscles and joints and extreme tiredness often lasting for several days. Photo by Kelly Sikkema on Unsplash

Flu can be an unpleasant illness causing fever, stuffy nose, dry cough, sore throat, aching muscles and joints and extreme tiredness often lasting for several days. Photo by Kelly Sikkema on Unsplash