Influenza, commonly known as the 'flu, is an infectious disease that infects birds and mammals (primarily of the upper airways and lungs in mammals) and is caused by an RNA virus of the Orthomyxoviridae family (the influenza viruses). The most common and characteristic symptoms of influenza in humans are fever, pharyngitis (sore throat), myalgia (muscle pains), severe headache, coughing, and malaise (weakness and fatigue).[1] A cold and a 'stomach flu' are very different from a flu. Influe ...
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Signs and symptoms
... The flu virus attacks your respiratory system. This leads to the symptoms you commonly experience with the flu. Some signs and symptoms, such as a runny nose, sneezing and sore throat, may initially s...
Source: MayoClinic

Causes
... You''re exposed to the flu when someone who''s infected with the influenza virus coughs or sneezes, or you touch something they''ve handled. That''s why the flu spreads rapidly anywhere people congreg...
Source: MayoClinic

Risk factors
... Children ages 6 months to 2 years and people older than 65 are considered at high risk of complications from influenza. You''re also at increased risk of influenza or its complications if you: Are a r...
Source: MayoClinic

When to seek medical advice
... See your doctor right away if you have flu symptoms and you''re at risk of a severe case of influenza or complications of the disease. For some people, drugs known as neuraminidase inhibitors may help...
Source: MayoClinic