Fever
Understand possible causes, learn when to seek care, and find the right provider.
Overview
A fever is a temporary rise in body temperature, usually a sign your body is fighting an infection. In adults, a fever is generally 100.4°F (38°C) or higher.
Most fevers are caused by viral infections and resolve on their own with rest and fluids.
Seek care for a very high fever, a fever that lasts several days, or a fever with concerning symptoms — and promptly for infants.
Quick Symptom Assessment
Answer a few questions to get more relevant provider recommendations.
This assessment is for informational purposes only and does not provide a medical diagnosis. If you're concerned about your symptoms, contact a healthcare provider. In an emergency, call 911.
Possible Causes
Common reasons people experience fever. This list isn't exhaustive or a diagnosis.
Viral infection
Colds, flu, and other viruses are the most common cause of fever.
Bacterial infection
Infections like strep throat or a UTI can cause fever and may need antibiotics.
Flu
Influenza causes fever along with body aches, cough, and fatigue.
Heat exhaustion
Overheating can raise body temperature, especially in hot climates.
Inflammatory conditions
Some non-infectious conditions can also cause fever.
Recommended Care
The right level of care depends on your symptoms. Here's where people with fever usually start.
Primary Care
Best first stop for most non-emergency symptoms. Your primary care provider can evaluate, order tests, and refer you if needed.
Urgent Care
For symptoms that need attention today but aren't life-threatening. Faster than the ER for minor injuries and illnesses.
Telehealth
Talk to a provider from home. Convenient for mild symptoms, follow-ups, and quick guidance on next steps.
Emergency Room
Only if you have red-flag symptoms below. Call 911 or go to the nearest emergency room right away.
Find Care Near You
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See all fever centersWhen to Seek Immediate Care
Call 911 or go to the nearest emergency room if you experience any of the following:
- Fever above 103°F (39.4°C) in adults
- Fever in an infant under 3 months
- Fever with a stiff neck, rash, or confusion
- Fever lasting more than 3 days
- Fever with difficulty breathing
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