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Fever: causes, warning signs & what to do
A fever (38°C / 100.4°F or above) is the body fighting infection. Most fevers are viral and settle in a few days — but certain features need prompt care.
Common causes of fever
- Viral infections (flu, COVID, common cold)
- Bacterial infections (throat, chest, urine)
- In many regions: typhoid, dengue, malaria
- COVID-19
- Post-vaccination (short-lived)
- Less commonly, inflammatory conditions
When to see a doctor urgently
- A stiff neck, non-fading rash, confusion or difficulty breathing — call your local emergency number now
- Fever in a baby under 3 months
- A very high fever that will not come down, or fever over 5 days
- Fever with severe pain, dehydration or a rapidly worsening condition
Frequently asked questions
What temperature counts as a fever?
Generally 38°C (100.4°F) or above. How you feel matters as much as the number — a lower reading with severe symptoms still deserves attention.
How do I bring a fever down at home?
Fluids, rest and appropriate paracetamol or ibuprofen for comfort. Watch for the red-flag signs above, and seek care for very young children or a fever that lingers.
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.