Flu symptoms are hard to recognize sometimes as they often appear as cold symptoms, however a telling sign of the flu is in the suddenness and intensity of which the symptoms hit you that are often accompanied by weakness and fatigue.
It could be if you have a high fever with it, or sometimes dehydration can cause similar symptoms. Anyone exhibiting delirium needs to get immediate urgent medical care.
By saying you have flu symptoms you are explaining how having the flu is making you feel.For example some people suffer with aches and pains, others headaches, runny nose
This stage is where the virus is in your symptom but you don't know it because you have NO symptoms yet, this is also the most contagious stage of the "sick cycle."