The "flu", also known as influena, is a highly contagious viral infection that invades the respiratory system. Though most people are aware of the flu, often the symptoms are not well-known, and as a result colds, stomach viruses, and other bugs are often mistaken for the flu. Identifying the flu and understanding the symptoms is critical so that you can properly care for yourself, especially since the flu can turn from mild to severe very quickly. It also helps to take preventative measures so you will not infect others.
The symptoms, as listed below, may be severe or may be mild when dealing with influenza. And any of these symptoms may change in severity at any time, in some cases very rapidly. Also be aware that even if you do not experience all of the symptoms, you may still have the flu.
It is important to note that there are a large number of strains of influenza virus, including the now infamous H1N1, or "swine flu". People who have swine flu will generally experience similar symptoms as those with other types of influenza. Flu vaccines, often referred to as "flu shots" are widely available in the U.S. and other countries each year, but do not protect against every strain of flu out there.http://www.cdc.gov/flu/symptoms.htm
Symptoms of Influenza
- Headache
- Body Aches
- Elevated fever
- Chills
- Extreme fatigue, weakness
- Dry Cough
- Running nose
- Sore throat
- Nausea, vomiting, diarrhea (only in children, except for cases of swine flu)http://www.webmd.com/cold-and-flu/flu-guide/adult-flu-symptoms
The Difference Between Cold and Flu Symptoms
Most people do not fully understand the difference between the flu and the common cold. The reason is understandable: The symptoms are extremely similar, and both are very common viruses that are circulated in a similar manner. But there are a few telltale differences that can help you to recognize if you have the flu.
Here are some common flu symptoms that are rare in colds:
- Fever
- Headache (aside from sinus pressure and headaches, which are common with colds)
- Fatigue / exhaustion
Also telling is how sudden the onset is. The flu is usually very sudden onset, whereas colds tend to show up very slowly.http://www.webmd.com/cold-and-flu/flu-guide/is-it-cold-flu
fever headache fatigue/exhaustion
Flu Symptoms
In this video, a medical expert describes the various symptoms of influenza, and how they differ from the common cold. Some of the biggest differences include the presence of a fever, which is standard with influenza, and exhaustion or malaise. As the doctor describes, if you are well enough to keep moving around and working, you probably don't have the flu.
Disclaimer
The content in this page is not a substitute for professional medical advice. Please contact a doctor before using the information presented here.
References
Fast Facts
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Flu onset
Usually very rapid
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Children's symptoms
May include nausea, vomiting, or diarrhea (unlike most adult flu cases)
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Key differences between flu and cold
Flu viruses cause exhaustion, high fevers, and may include headaches
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Flu prevention
Good hygiene and hand washing; getting a flu shot annually
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Number of reported influenze cases in the U.S. per year
25-50 million cases
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Number of people around the world who die from the flu annually
About 300,000-500,000
