A fever is generally considered a body temperature of 100.4°F (38°C) or higher. When is a fever too high?
- For most adults, a fever of 103°F (39.4°C) or higher warrants contacting a healthcare provider.
- If the fever reaches 104°F (40°C) or above, medical advice should be sought promptly.
- A temperature of 105°F (40.5°C) or higher requires immediate emergency care.
- Fevers above 106.7°F (41.5°C), known as hyperpyrexia, are exceptionally high and can cause serious complications such as brain damage, seizures, or organ failure
Special considerations:
- People over 65 or those who are immunocompromised should contact a doctor if their fever reaches 101°F (38.3°C) or higher, as they are at greater risk of complications
- Untreated fevers above 105.8°F (41°C) can be dangerous and may cause organ malfunction
- High fever in children also requires careful monitoring, with emergency care advised if the fever exceeds 104°F (40°C) or if accompanied by concerning symptoms
Additional symptoms requiring urgent care with fever include:
- Seizures
- Loss of consciousness or confusion
- Stiff neck
- Difficulty breathing
- Severe pain or swelling
- Persistent vomiting
- Discolored or foul-smelling vaginal discharge or urine
In summary, while mild to moderate fevers can be part of the body's immune response, fevers reaching 103°F and above in adults, especially 105°F or higher, are considered too high and require medical attention or emergency care depending on severity and associated symptoms
