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Cold vs influenza: What's the difference?

Although people tend to lump "colds" and influenza (commonly called "the flu") together, they really are distinct infections, caused by different viruses. A very bad cold cannot turn into influenza (although a person with a cold could certainly come down with influenza if he or she came in contact with influenza virus).

How can you tell the difference between a cold and influenza? The following comparison points out the similarities and differences. Of course, in the case of any severe or long-lasting illness, you should contact your doctor.

Symptom   Cold   Influenza
Fever   Rare in adults and older children, but can be as high as 102°F in infants and
small children
  Usually 102°F, but can go up to 104°F and usually lasts 3 to 4 days
   
Headache   Rare   Sudden onset and can be severe
   
Muscle aches   Mild   Usually, and often severe
   
Tiredness and weakness   Mild   Can last 2 or more weeks
   
Extreme exhaustion   Never   Sudden onset and can be severe
   
Runny nose   Often   Sometimes
   
Sneezing   Often   Sometimes
   
Sore throat   Often   Sometimes
   
Cough   Mild, hacking cough   Usually, and can become severe
   



Source: Adapted from National Institute of Allergy and Infectious Diseases. Is it a cold or the flu? Available on-line at: http://www.niaid.nih.gov/publications/cold/sick.pdf


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This page last updated: 23-May-2006