Symptoms
Initially, the flu may seem like a common cold with a runny nose, sneezing and sore throat. But colds usually develop slowly, whereas the flu tends to come on suddenly. And although a cold can be a nuisance, you usually feel much worse with the flu.
Common signs and symptoms of the flu include:
Fever over 101 F (38 C) in adults, and often as high as 103 to 105 F (39.5 C to 40.5 C) in children
Chills and sweats
Headache
Dry cough
Muscular aches and pains, especially in your back, arms and legs
Fatigue and weakness
Nasal congestion
Loss of appetite
Diarrhea and vomiting in children
When to see a doctor
If you have flu symptoms and are at risk of complications, see your doctor right away. Taking antiviral drugs within the first 48 hours after you first notice symptoms may reduce the length of your illness by a day or two and may help prevent more serious problems. Seek immediate medical care if you have signs and symptoms of pneumonia. These include a severe cough that brings up phlegm, a high fever and a sharp pain when you breathe deeply. If you have bacterial pneumonia, you'll need treatment with antibiotics.
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