updated 8/30/2009 3:23:52 PM ET 2009-08-30T19:23:52

When is swine flu just miserable and when do you need a doctor?

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If it's hard to breathe, that's an emergency. It's the not-so-obvious cases that can have parents, or the sick of any age, fretting.

"There tends to be a lot of hysteria," said Dr. Nathan Litman of the Children's Hospital at Montefiore Medical Center in New York. "We should try to emphasize the prevention mode, and the rational approach to dealing with the illness rather than when the child has a runny nose running to the emergency room."

Symptoms of any flu include fever of 100 degrees or more, cough, body chills and aches, congestion. Diarrhea and vomiting sometimes occur, particularly with the swine flu that doctors call the 2009 H1N1 flu.

Regardless of the strain, most people who otherwise are healthy need to stay home and rest, and get plenty of fluids, health officials agree.

But there's a catch. Not everyone with swine flu gets a fever, making it hard to know if they've got that or a common cold.

That doesn't happen too often, although there are no good statistics and no one knows if those people even are as contagious as the fevered, said Dr. Anne Schuchat, director of the Centers for Disease Control and Prevention's National Center for Immunization and Respiratory Diseases. But generally, people without a fever don't get as sick.

Signs to seek emergency care include shortness of breath, chest pain or pressure, confusion or seizures, persistent vomiting or inability to hold down liquids, bluish lips.

Who's at higher risk from any kind of flu?

Pregnant women; people of any age with heart disease, asthma, diabetes and other chronic illnesses; children under 2; people over 65.

While the over-65 tend not to catch swine flu, they are prime targets of the regular winter flu — and there's no way for patients to tell the two apart.

Litman said doctors would rather get a call from or see a high-risk person "sooner rather than later" to decide if they need the anti-flu medications Tamiflu or Relenza. The drugs work best if taken within the first 48 hours of symptoms.

If fever goes away and then a new one sets in days later, seek medical care, Litman said. That can be a sign of bacterial infections that sometimes follow any type of flu.

For children, pediatricians advise watching activity levels. Being listless or lethargic can be a warning sign of worsening illness.

What if people without insurance can't afford the $100 or so anti-flu drugs? The government has shipped millions of doses from a federal stockpile to the states, and in what's being cited as a model program, Texas is using its stockpiled supply in part for those patients.

Doctors certify the person's lack of insurance coverage when they write the prescription and direct the patient to certain pharmacies. The goal is to have at least one pharmacy in every county that then fills the prescription for free or a nominal fee, said the state's health commissioner, David Lakey.

© 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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