influenza (also known as the flu) is a contagious respiratory illness caused by flu viruses. it can cause mild to severe illness and at times can lead to death. the flu is different from a cold. the flu usually comes on suddenly. people who have the flu often feel some or all of these symptoms: • fever* or feeling feverish/chills • cough • sore throat • runny or stuffy nose • muscle or body aches • headaches • fatigue (tiredness) • some people may have vomiting and diarrhea though this is more common in children than adults. * it's important to note that not everyone with flu will have a fever. most people who get influenza will recover in a few days to less than two weeks but some people will develop complications (such as an ear infection) as a result of the flu. pneumonia bronchitis sinus and ear infections are examples of complications from flu.
what are the systems of the flu is ear ache one?