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Published on: 12/1/2025
What are the first symptoms that suggest you might have the flu, not a cold?
The flu usually starts suddenly with a high fever, body aches, and extreme tiredness, while a cold comes on more gradually with a runny nose and sore throat.
Worried about flu symptoms?
Explanation
When trying to tell if you have the flu or just a cold, it's important to look at how quickly your symptoms start and how severe they are.
Flu Symptoms:
- Sudden Onset: The flu often begins very quickly.
- High Fever: A high fever is common with the flu.
- Body Aches: You might feel like your whole body hurts.
- Extreme Tiredness: Feeling very tired is a big sign of the flu.
Cold Symptoms:
- Gradual Onset: Colds usually start slowly.
- Runny Nose and Sore Throat: These are more common with colds than the flu.
According to the medical literature, the flu's symptoms are more intense and sudden compared to a cold. If you notice these flu symptoms, it's a good idea to stay home and rest, and consider seeing a doctor if you feel very unwell.
(References)
- Cate TR. (1987). Clinical manifestations and consequences of influenza. The American journal of medicine, 3591813.
- Monto AS, Gravenstein S, Elliott M, Colopy M, & Schweinle J. (2000). Clinical signs and symptoms predicting influenza infection. Archives of internal medicine, 11088084.
- Gaitonde DY, Moore FC, & Morgan MK. (2019). Influenza: Diagnosis and Treatment. American family physician, 31845781.
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