The symptoms of flu are very close to those of colds and other viruses that occur during the same season. You may cough and sneeze, have a stuffy nose and sore throat, and general aches and pains with a cold.
When you have the flu, these are accompanied with high fever (102 to 104 degrees F) that lasts 3-4 days and a bad headache. There can be severe aches, pains, and weakness. Extreme exhaustion is an early warning sign and may be accompanied with chest discomfort.