- Slideshow: Foods to Eat When You Have the Flu
- Slideshow: Natural Cold & Flu Remedies
- Slideshow: Finding Relief for Your Cough
- Patient Comments: Flu (Influenza) - Symptoms
- Patient Comments: Flu (Influenza) - Side Effects
- Flu (influenza, conventional, H1N1, H3N2, and bird flu [H5N1]) facts
- What is flu (influenza)?
- When does flu season begin and end?
- Flu vs. cold
- What are the causes of the flu (influenza)?
- What are flu (influenza) symptoms in adults and in children?
- What is the incubation period for the flu?
- How long is the flu contagious, and how long does the flu last?
- How is the flu (influenza) diagnosed?
- How does flu spread?
- What is the key to flu (influenza) prevention?
- Are there any flu shot or nasal spray vaccine side effects in adults or in children?
- How effective is the flu vaccine?
- Why should the flu (influenza) vaccine be taken every year?
- What are some flu treatments an individual can do at home (home remedies)?
- What types of doctors treat the flu?
- What can people eat when they have the flu?
- When should a person go to the emergency department for the flu?
- Who should receive the flu vaccine, and who has the highest risk factors? When should someone get the flu shot?
- What is the prognosis for patients who get the flu? What are possible complications of the flu?
- Can the flu be deadly?
- What is the bird (avian) flu?
- Do antiviral agents protect people from the flu?
- What medications treat the flu?
- Is it safe to get a flu shot that contains thimerosal?
- Where can people find additional information about the flu?
Quick GuideFlu Pictures Slideshow: 10 Foods to Eat When You Have the Flu
When does flu season begin and end?
Flu season officially begins in October of each year and extends to May of the following year. According to the U.S. Centers for Disease Control and Prevention (CDC), people can follow the development of flu across the United States by following CDC's weekly update of the locations where flu is developing in the U.S. (see the flu map).
Flu vs. cold
Compared with most other viral respiratory infections, such as the common cold, influenza (flu) infection usually causes a more severe illness with a mortality rate (death rate) of about 0.1% of people who are infected with the virus. Cold symptoms (for example, sore throat, runny nose, cough, congestion, and slight fever) are similar to flu symptoms, but the flu symptoms are more severe, last longer, and may include vomiting and diarrhea.
The following table is provided by the CDC to help distinguish between a cold and influenza:
|Signs and Symptoms||Influenza||Cold|
|Fever||Usual; lasts 3-4 days||Rare|
|Aches||Usual; often severe||Slight|
|Chest discomfort, cough||Common; can be severe||Mild to moderate; hacking cough|