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1. • • A viral fever is caused by infection with a virus. Viruses are very small infectious agents. They infect and multiply within the cells of your body. A fever is your body’s way of fighting off a virus. Many viruses are sensitive to shifts in temperature, so a sudden increase in your body temperature makes you less hospitable to viruses.
     www.healthline.com/health/viral-fever

     Viral Fever: Symptoms, Causes, Diagnosis, Treatment, and Warning

2. my.clevelandclinic.org › health › symptomsFever Symptoms & Causes: What Is Considered a Fever?

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   A fever is when your body temperature is higher than your normal average temp. Most providers say a fever is either 100.0 F (37.8 C) or 100.4 F (38 C). When you have a fever, it’s your body’s normal response to fighting an infection or illness. Fevers usually aren’t a serious concern.

3. www.mayoclinic.org › diseases-conditions › feverFever - Symptoms and causes - Mayo Clinic

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   May 7, 2022 · Fevers below 104 F (40 C) associated with common viral infections, such as the flu, may help the immune system fight disease and are generally not harmful. Fever or elevated body temperature might be caused by: A viral infection; A bacterial infection; Heat exhaustion

4. my.clevelandclinic.org › health › diseasesViral Infection: Causes, Symptoms, Tests & Treatment

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   Nov 23, 2022 · Go to the nearest ER or seek immediate medical attention if you have signs of a serious infection, including: High fever (103 degrees Fahrenheit/39.4 degrees Celsius). Difficulty breathing.

5. www.verywellhealth.com › fever-8685009Fever: Temperature Range, What’s Serious, Breaking It

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   Aug 21, 2024 · Fever is a response to something in the body, usually a viral infection like the flu or COVID-19. Bacterial infections, such as urinary tract or skin infections, can also trigger fevers, as can noninfectious causes like autoimmune diseases or drug reactions.

   • Author: Colleen Doherty, MD

6. www.webmd.com › covid › what-is-a-feverFever Symptoms & Causes: What Is Considered a Fever? - WebMD

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   Jun 20, 2024 · 10 min read. What Is a Fever? A fever is when your body temperature is higher than usual, often due to an infection or illness. Doctors generally consider a fever to be an oral temperature...

7. www.webmd.com › first-aid › fevers-causes-symptomsFever: Causes, Symptoms, and Treatment - WebMD

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   Nov 15, 2023 · 6 min read. What Is a Fever? A fever is a sure sign your body is fighting off some type of infection. (Photo credit: E+/Getty Images) A fever is when you have a brief rise in body...

8. People also ask

   Is a fever a sign of a serious infection?

   • A fever is a temporary rise in body temperature. It's one part of an overall response from the body's immune system. A fever is usually caused by an infection. For most children and adults, a fever may be uncomfortable. But it usually isn't a cause for concern. For infants, however, even a low fever may mean there's a serious infection.

   Fever - Symptoms and causes - Mayo Clinic

   www.mayoclinic.org/diseases-conditions/fever/symptoms-causes/syc-20352759 

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   Is fever a symptom of a viral infection?

   • No formal or standard definition exists for fever, as it can vary depending on age, time of day, and where it's measured on the body (e.g., mouth, rectal, ear, underarm, or forehead). Most cases of fever are due to viral infections.

   Fever: Temperature Range, What’s Serious, Breaking It - Verywell Health

   www.verywellhealth.com/fever-8685009

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   What are the symptoms of a fever?

   • Other symptoms you might have when you have a fever include: If you're an older adult, serious infections tend to cause symptoms such as confusion or weight loss rather than fever. Doctors consider a temperature that’s 2 degrees higher than usual to be a sign of infection.

   Fever Symptoms & Causes: What Is Considered a Fever? - WebMD

   www.webmd.com/covid/what-is-a-fever

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9. www.msdmanuals.com › feverFever - Fever - MSD Manual Professional Edition

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   Fever and rash have many infectious and drug causes. Petechial or purpuric rash is of particular concern; it suggests possible meningococcemia, Rocky Mountain spotted fever (particularly if the palms or soles are involved), or, less commonly, some viral infections (eg, dengue fever, hemorrhagic fevers).