Influenza, or flu, is a viral infection of the nose, throat and lungs that comes on suddenly with fever, body aches and exhaustion. Most healthy people recover in a week or two, but flu can be serious for young children, older adults, pregnant women and people with long-term illnesses. In India, flu peaks in the monsoon and in winter. A yearly vaccine is the best protection. Ayurveda describes fevers as Jvara.
| Flu | Common cold | COVID-19 | Dengue | |
|---|---|---|---|---|
| Onset | Sudden | Gradual | Gradual or sudden | Sudden high fever |
| Fever | Common, high | Rare | Common | High, often 2–7 days |
| Body aches | Severe | Mild | Common | Severe (“break-bone”), pain behind eyes |
| Cough, runny nose | Cough common | Runny nose, sneezing | Cough; loss of smell or taste | Usually absent |
| Test | Swab, if needed | None needed | Swab | Blood test (NS1, platelets) |
During the monsoon, a high fever with body aches in India may be dengue, malaria or typhoid rather than flu. A fever lasting more than 2–3 days needs a doctor and blood tests. Avoid ibuprofen and aspirin until dengue is ruled out.
Most people need rest, fluids and fever control only. Antiviral medicine (oseltamivir) helps most when started within 48 hours of symptoms, and is recommended for people at higher risk or who are seriously ill — see a doctor early if you are in a risk group. Antibiotics don't treat flu; they are only needed if a bacterial complication such as pneumonia develops.
The flu vaccine is updated every year and is recommended annually, especially for high-risk groups, pregnant women, health workers and older adults. Ask your doctor about the best time — many parts of India have flu peaks before or during the monsoon. The vaccine cannot give you flu. Handwashing, masks in crowded places during outbreaks, and staying home when ill reduce spread.
Fever (Jvara) is the first disease discussed in the Charaka Samhita. Flu, with fever, body aches, headache, cough and runny nose, resembles Vata-Kapha Jvara; contagious fevers spreading in communities are described as Janapadodhwamsa-type epidemics linked to seasons and polluted air and water. Classical care recommends rest, light fasting or thin gruels (peya, yavagu) while fever is high, warm boiled water, and bitter, fever-reducing herbs.
Tulsi leaves, ginger, black pepper and a little jaggery simmered in water; sip warm. See the Tulsi guide.
Light, warm, liquid food while fever is high; build up gradually.
Commonly used in fevers — see the Guduchi guide for liver safety.
Herbal remedies don't replace antivirals for high-risk people, or tests for dengue, malaria and typhoid when fever persists. Very strong kadha taken many times a day can irritate the stomach. Use licensed products.
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Reviewed against NHS: Flu, the WHO fact sheet on seasonal influenza, NHS: Dengue, NCCIH: Ayurvedic Medicine, and Ministry of Ayush pharmacovigilance. These links support education and do not replace individual medical advice.