"However, some people are more likely to get flu complications and they should talk to a health care provider about whether they need to be examined if they get flu symptoms this season. They are:
* Children younger than 5, but especially children younger than 2 years old
* People 65 and older
* Pregnant women
* People who have:
o Cancer
o Blood disorders (including sickle cell disease)
o Chronic lung disease
o Diabetes
o Heart disease
o Kidney disorders
o Liver disorders
o Neurological disorders (including nervous system, brain or spinal cord)
o Neuromuscular disorders (including muscular dystrophy and multiple sclerosis)
o Weakened immune systems (including people with AIDS)
Also, it’s possible for healthy people to develop severe illness from the flu so anyone concerned about their illness should consult a health care provider.
There are emergency warning signs. Anyone who has them should get medical care right away.
What are the emergency warning signs?
In children
* Fast breathing or trouble breathing
* Bluish skin color
* Not drinking enough fluids
* Not waking up or not interacting
* Being so irritable that the child does not want to be held
* Flu-like symptoms improve but then return with fever and worse cough
* Fever with a rash
In adults
* Difficulty breathing or shortness of breath
* Pain or pressure in the chest or abdomen
* Sudden dizziness
* Confusion
* Severe or persistent vomiting
Do I need to go the emergency room if I am only a little sick?
No. The emergency room should be used for people who are very sick. You should not go to the emergency room if you are only mildly ill.Photo of sick child If you have the emergency warning signs of flu sickness, you should go to the emergency room. If you get sick with flu symptoms and are at high risk of flu complications or you are concerned about your illness, call your health care provider for advice. If you go to the emergency room and you are not sick with the flu, you may catch it from people who do have it"
http://www.cdc.gov/h1n1flu/sick.htm