General Health

Fever in Adults and Children — When It Becomes Dangerous

2025-08-14 • Updated 2025-08-21

When a Fever Becomes Dangerous: Adults vs Children

A fever is a temporary rise in body temperature, often a sign of infection — but some fevers require urgent care.

Summary
The danger level depends on age, symptoms, and underlying health.

Adults — seek urgent care if:

• Temp >40°C (104°F)
• Confusion or difficulty breathing
• Persistent vomiting
• Severe headache or stiff neck

Children — seek urgent care if:

• Temp >38°C (100.4°F) in infants under 3 months
• Persistent crying or irritability
• Rash that doesn’t fade when pressed
• Seizures

Self-care for mild fevers

• Stay hydrated
• Rest
• Use fever-reducing medicine if uncomfortable (per instructions)

Fever-reducing medicines

• Paracetamol (acetaminophen): Safe for adults and children. Use if the fever is causing discomfort, aches, or trouble resting. Always follow the dosing on the package.
• Ibuprofen: Can also reduce fever and ease pain. Suitable for adults and children over 6 months.
  • Avoid in people with stomach ulcers, kidney problems, or certain heart conditions.
  • Do not give to children with suspected chickenpox or dehydration unless advised by a doctor.
• Tip: It’s usually fine to use either paracetamol or ibuprofen, but alternating them isn’t usually needed unless a doctor specifically recommends it.

References

• NHS — fever in adults and children
• American Academy of Pediatrics — when to call the doctor

Educational only; not a substitute for professional medical advice.

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