Flu Symptoms, Causes and Prevention: What to Know
Flu can arrive suddenly, bringing fever or chills, body aches, cough and profound tiredness. Learn how to recognize influenza, reduce its spread, care for yourself at home and know when to seek medical help.
What Is the Flu?
Influenza, commonly called the flu, is a contagious respiratory infection caused by influenza viruses. It can be mild or severe. Complications can include pneumonia and worsening of long-term conditions such as asthma, heart disease or diabetes.
Anyone can get flu, but the risk of serious complications is higher for adults 65 and older, young children, pregnant people, people with certain chronic conditions and people with weakened immune systems.
Common Flu Symptoms
Flu symptoms often begin suddenly, usually one to four days after exposure. Common symptoms include:
- Fever or feeling feverish, with chills
- Cough, often dry
- Sore throat
- Runny or blocked nose
- Muscle or body aches
- Headache
- Marked tiredness or weakness
- Sometimes vomiting or diarrhea, especially in children
Not everyone with flu has a fever. Symptoms may range from mild to severe.
Flu vs. a Cold: What Is the Difference?
| Feature | Cold | Flu |
|---|---|---|
| Onset | Usually gradual | Often sudden |
| Fever | Uncommon or mild | Common, but not present in everyone |
| Body aches | Usually mild | Common and may be intense |
| Tiredness | Usually mild | Often pronounced |
| Nose and throat symptoms | Often the main symptoms | May occur alongside whole-body symptoms |
| Cough | Usually mild to moderate | Common and may be severe |
Flu, COVID-19 and other respiratory infections can look alike. Symptoms alone cannot reliably tell them apart; testing may be needed.
What Causes the Flu and How Does It Spread?
Influenza spreads mainly through respiratory particles released when an infected person coughs, sneezes or talks. Transmission is more likely during close contact and in crowded or poorly ventilated spaces. The virus can also spread when someone touches contaminated hands or surfaces and then touches their eyes, nose or mouth.
People can spread flu before they realize they are ill. They are often most infectious during the first few days of symptoms; children and people with weakened immune systems may remain infectious longer.
How to Prevent the Flu
- Get the seasonal flu vaccine. It is the best-established way to reduce the risk of flu and its complications. Follow the schedule recommended by your local health authority.
- Wash your hands regularly with soap and water, or use an alcohol-based hand sanitizer when soap is unavailable.
- Cover coughs and sneezes with a tissue or the bend of your elbow, then dispose of tissues and wash your hands.
- Stay home when you are unwell and avoid close contact with others until you feel well enough to resume normal activities and any fever has resolved.
- Improve indoor ventilation and avoid crowded, poorly ventilated spaces when respiratory viruses are circulating.
- Support general health with adequate sleep, regular activity and a balanced diet. These habits support overall health but do not replace vaccination.
Can Vitamins and Supplements Help?
No vitamin or supplement is a substitute for vaccination, antiviral treatment or medical care, and no supplement is proven to prevent influenza. Vitamin or mineral deficiencies may affect general health, but taking extra supplements without a confirmed need is not a reliable flu-prevention strategy.
Be cautious with products marketed as “immune boosters,” “flu cures” or guaranteed prevention. Supplements can interact with medicines and may be inappropriate during pregnancy, breastfeeding, childhood or certain medical conditions. Ask a doctor or pharmacist before starting one.
What to Do If You Have the Flu
- Rest and sleep as much as you need.
- Drink plenty of fluids to reduce the risk of dehydration.
- Use paracetamol/acetaminophen or ibuprofen only as directed and only if suitable for you. Check combination cold-and-flu products to avoid taking the same ingredient twice.
- Do not give aspirin to children under 16 unless a healthcare professional specifically advises it.
- Ask a clinician promptly about prescription antiviral medicine if you are at higher risk of complications, feel very unwell or have severe symptoms. Antivirals work best when started early, often within 48 hours, but a clinician may still recommend them later in some cases.
- Antibiotics do not treat influenza because it is caused by a virus. They are used only when a clinician diagnoses a bacterial infection.
When to Seek Medical Help
Seek urgent medical care for difficulty breathing, shortness of breath, persistent chest or abdominal pain or pressure, confusion, inability to wake, seizures, severe weakness, dehydration or not urinating, or a fever or cough that improves and then returns or worsens.
Contact a healthcare professional promptly if you are 65 or older, pregnant or recently gave birth, have a long-term condition, have a weakened immune system, feel very unwell, or symptoms are not improving. Children may show different warning signs, so seek advice if you are concerned.
Frequently Asked Questions
How long does the flu last?
Many people start to feel better within a few days and recover in less than two weeks. Cough and tiredness can last longer. Seek medical advice if symptoms are severe, worsening or not improving.
How long is the flu contagious?
People can spread flu from about one day before symptoms begin and are often most infectious during the first few days of illness. Children and people with weakened immune systems may remain infectious longer.
Can you get the flu after a flu shot?
Yes. Flu vaccines do not prevent every infection, but vaccination reduces the risk of flu and can reduce the severity and risk of complications.
What are the first signs of the flu?
Flu often begins suddenly with fever or chills, aches, marked tiredness, headache, cough and sore throat. Not everyone with flu has a fever.
How can I tell if it is the flu or COVID-19?
The symptoms overlap, so symptoms alone cannot reliably distinguish them. Testing is the best way to identify the infection.
What helps you recover at home?
Rest, sleep, fluids and appropriately used over-the-counter medicine may help relieve symptoms. Ask a clinician promptly about antiviral treatment if you are at higher risk or become seriously ill.
Do vitamins or supplements prevent the flu?
No supplement is a substitute for flu vaccination or medical care, and no supplement is proven to prevent influenza. Discuss supplements with a clinician or pharmacist, especially during pregnancy or when taking medicines.
Final Thoughts
Flu can be unpleasant and sometimes serious, but vaccination, hand hygiene, ventilation and staying home when sick can reduce risk and spread. If you develop warning signs or have a higher risk of complications, seek medical advice early.
Sources and Further Reading
Medical disclaimer: This article is for general information only and is not medical advice, a diagnosis or a substitute for care from a qualified healthcare professional. Health guidance and vaccine recommendations can vary by country and change over time. Consult a clinician or pharmacist for advice specific to your situation.
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