A cold and flu can feel alike for the first few hours, but they are not the same illness. Flu comes on suddenly and knocks you off your feet; a cold builds slowly and stays mostly in your nose and throat. Knowing which you have helps you decide whether to rest at home or get help.
Imagine feeling fine at lunchtime and shivering under a blanket by evening, too tired to stand. That speed is the classic sign of flu, and for some people it is the cue to call a doctor within two days, while antiviral medicine still works best.
| Cold | Flu | |
|---|---|---|
| How it starts | Gradually, over a day or two | Suddenly, often within hours |
| Main symptoms | Blocked or runny nose, sneezing, sore throat | Fever, aches, chills, exhaustion, dry cough, headache |
| Fever | Uncommon in adults | Common, often high |
| Can you work? | Usually feel able to carry on | Usually too unwell to do normal activities |
| How long | About a week | Usually better within about a week, though tiredness can linger |
What helps
- Rest and plenty of fluids
- Paracetamol or ibuprofen for fever and aches, following the label
- Antibiotics do not work for colds or flu, because both are caused by viruses
- People at higher risk of complications may be offered antiviral medicine for flu, which works best if started within 2 days of symptoms
Warning signs: get medical help
- Difficulty breathing or shortness of breath
- Chest pain or pressure
- Confusion, or being hard to wake
- A high fever that won’t come down, or a seizure
- Symptoms that improve, then come back worse
- In children: fast breathing, blue lips, not drinking, or fewer wet nappies
How long are you contagious?
According to the CDC, people with flu are most contagious in the first three to four days of illness and can spread it from about a day before symptoms start. Stay home while you have a fever, wash your hands often and cover coughs and sneezes.
But is the flu jab worth it if I’m young and healthy?
It doesn’t guarantee you won’t get flu, but it lowers your risk of catching it and of becoming seriously ill. It also protects the people around you. For nurses that includes every patient you care for, which is why health workers are among the groups the World Health Organization prioritises for vaccination.
Your next step: Check when this season’s flu vaccine is available where you live or work, and book it. If you are ill now, rest, drink fluids and watch for the warning signs above.
Sources: NHS, “Flu” and “Common cold”; US Centers for Disease Control and Prevention (CDC), “Flu symptoms and complications”; World Health Organization, “Influenza (seasonal)”. This guide is for general information and does not replace advice from your own nurse, doctor or pharmacist.
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