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Influenza (Flu)
Influenza is a viral infection of the airways that causes sudden fever, aches and tiredness. Most people recover in about a week, but it can be serious in high-risk groups.
Causes & risk factors
- Influenza viruses that change each year
- Spread through coughs, sneezes and close contact
- Touching contaminated surfaces then the face
- Crowded indoor spaces in flu season
- Higher risk if unvaccinated
Common symptoms
Tests & diagnosis
- Usually diagnosed from symptoms
- Rapid flu swab test if needed
- Chest X-ray if pneumonia is suspected
- Blood oxygen (pulse oximetry)
Treatment & management
- Rest and plenty of fluids
- Paracetamol for fever and aches
- Antivirals for high-risk people or severe cases
- Staying home to avoid spreading it
- Yearly vaccination helps prevent it
When to see a doctor urgently
- Severe breathlessness or chest pain — call your local emergency number now
- Confusion, blue lips or unable to stay awake — emergency
- High fever not settling, especially in the very young or elderly
- Symptoms improving then suddenly worsening (possible pneumonia)
Not a diagnosis. MedDroid gives general educational information about influenza (flu). It cannot examine you, diagnose or prescribe — always confirm with a qualified doctor.
Frequently asked questions
Is flu just a bad cold?
No. Flu tends to come on suddenly with high fever and severe body aches, and can be more serious, especially for older or high-risk people.
Do I need the flu vaccine every year?
Yes. Flu viruses change each year, so an annual vaccine gives the best protection, especially for high-risk groups.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.