Yes it can be. Other symptoms are fever, loss of appetite, weakness, cough, muscles that ache, nausea and vomiting. There is a difference in the flu and a cold.
It is one of the symptoms of the flu but it is most common in children than adults. Other major symptoms are high fever, headache, chills, muscle soreness and extreme tiredness.
Diarrhea is a condition in which a person has frequent discharges of liquid faeces from the bowel. This is may or may not be a symptom of flu, as flu is mainly a viral infection and diarrhea is mainly caused by bacterial or amoebic infection. In rare occasion there are cases with diarrhea when suffering from flu
I think it could be a sympton of the flu. Mostly you just get fever and ache all over really bad.I think you could get an upset tummy from just being sick or nauseated from the flu.
