When is a fever cause for concern?
If any of the following situations apply, call a doctor as soon as possible:
- A fever accompanied by a stiff neck, confusion or irritability.
- A fever remaining above 103°F (39.5°C) longer than two hours after home treatment.
- A fever lasting longer than two days.
- High fever accompanied by rash.
- Photophobia (irritated by light).
- Dehydration (less amount of urine, sunken eyes, no tears).
Any fever in an adult that goes above 105°F (or 40.5°C) and does not come down with treatment is a life-threatening medical emergency and you should call 911.