Fever is a temporary rise in body temperature, often caused by an infection. It is a sign that your body is fighting off an illness, such as a virus, bacteria, or inflammation.
Normal Body Temperature Range
- Typically between 97°F and 99°F (36.1°C to 37.2°C)
What Temperature Is Considered a Fever?
- Low-grade fever: 99.5°F to 100.3°F (37.5°C to 37.9°C)
- Moderate fever: 100.4°F to 102°F (38°C to 38.9°C)
- High fever: 102.1°F to 104°F (39°C to 40°C)
- Very high fever: Above 104°F (40°C) – needs urgent care
- Dangerously high: Above 105.8°F (41°C) – may lead to complications
Common Causes of Fever
- Viral infections: Cold, flu, COVID-19
- Bacterial infections: Strep throat, urinary tract infections
- Inflammatory conditions: Rheumatoid arthritis, autoimmune diseases
- Heat exhaustion or heatstroke
- Vaccination side effects in children or adults
Symptoms That Often Accompany Fever
- Chills or shivering
- Sweating
- Headache
- Muscle aches
- Fatigue
- Dehydration
- Loss of appetite
When to Seek Medical Help
- Fever over 103°F (39.4°C)
- Lasts more than 3 days
- In infants under 3 months with a rectal temperature above 100.4°F (38°C)
- Accompanied by confusion, rash, stiff neck, or difficulty breathing
How to Manage a Fever at Home
- Drink plenty of fluids
- Rest
- Take fever-reducing medicines like paracetamol (acetaminophen) or ibuprofen if needed
- Keep the room cool and wear light clothing