Appetite - loss   Body - ache Chest - pain
Chills Cough Diarrhea
Fatigue/exhaustion Fever Head - ache
Indigestion Muscles - aching Nausea
Nose - runny Sneezing Sweating
Throat - sore Tongue - coated Vomiting
Influenza, also called grippe or flu, is an infection of the respiratory tract in the nose, throat, and sometimes the lungs, caused by types of viruses designated A, B, and C.

Types A and B cause epidemic disease, and type C causes sporadic disease. Type A is the most common.

Influenza occurs as sporadic illness, epidemics, or pandemics. Typical symptoms of influenza begin 2-3 days after exposure to the virus. The majority of individuals has symptoms for about one to two weeks and then recovers with no problems.
Stomatitis lips ulcer   Stomatitis and dry swollen lips
Sometimes stomatitis develop during the flu and dry swollen lips with ulcers may appear.
White coated tongue
White coated tongue may also appear during flu.

The flu virus continually change over time, usually by changing the viral RNA (mutation) and is often confused with the common cold, but flu symptoms are usually more severe than the typical sneezing and stuffiness of a cold.
Since most cases of influenza are self-evident, they do not need to be tested. However, if the case is suspicious and the doctor need to rule out other viral or bacterial infections, blood and a sample  from the nose or throat are taken for laboratory testing.
  More information:
Influenza Treatment
Influenza Healthcare Centers

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