Influenza
Also known as: Flu, Seasonal Flu, Swine Flu (H1N1)
Influenza is a contagious viral infection of the nose, throat and lungs that causes sudden fever and body ache and can be serious in high-risk groups.
Symptoms
- Sudden high fever
- Body ache
- Headache
- Dry cough
- Sore throat
- Tiredness
Causes
- Influenza A and B viruses
Risk factors
- Age over 65
- Pregnancy
- Young children
- Chronic illness
Complications
- Pneumonia
- Worsening of asthma or heart disease
Treatment overview
Rest, fluids, fever control; antiviral oseltamivir for high-risk or severe cases as prescribed.
Prevention
- Yearly flu vaccine
- Hand hygiene
When to see a doctor
If breathless, chest pain, or symptoms worsen after initial improvement.
Tests used
Medicines used
Vaccines
Specialists who treat it
Frequently asked questions
What are the symptoms of Influenza?
Sudden high fever, Body ache, Headache, Dry cough, Sore throat, Tiredness
What causes Influenza?
Influenza A and B viruses
How is Influenza treated?
Rest, fluids, fever control; antiviral oseltamivir for high-risk or severe cases as prescribed.
How can Influenza be prevented?
Yearly flu vaccine, Hand hygiene
Medically reviewed by
Medical review pending
Last updated
9 October 2026
Sources
- World Health Organization fact sheets
- ICMR and MoHFW national guidelines
- National Centre for Disease Control (NCDC)
This information is for general awareness and does not replace advice from a qualified doctor. Do not start, stop or change any medicine without medical advice.