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1. www.health.harvard.edu › treating-fever-in-adultsFever in adults: when to worry - Harvard Health

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   May 22, 2023 · The average body temperature is 98.6° F (37°C). But "normal" body temperature varies from person to person. It also changes during the day, rising a bit after you eat or exercise. Body temperature is often higher in the afternoon than it is when you wake up in the morning. Fever means a body temperature of 100.4° F (38°C) or higher.

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

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   A fever is when your body temperature rises higher than normal. A fever itself isn’t an illness. Rather, it’s a symptom of a wide range of health conditions. When your body temperature rises a few degrees above normal, it can be a sign that your immune system has been activated, often to fight an infection. It can also be a side effect of ...

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

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   May 7, 2022 · Ask your child's health care provider for guidance in special circumstances, such as a child with immune system problems or with a preexisting illness. Adults. Call your health care provider if your temperature is 103 F (39.4 C) or higher. Seek immediate medical attention if any of these signs or symptoms accompanies a fever: Severe headache; Rash

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

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   Jun 20, 2024 · 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 of 100 F (37.8 C) or higher.

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

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   Nov 15, 2023 · A fever is a sign of an illness or infection. When you have one, you may notice these symptoms: Chills or shivering; Sweating; ... Most fevers get better without any problems, but some can have ...

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

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   Aug 21, 2024 · A high fever in older children and adults is a temperature of 102.4 F or greater. Fevers above 105.8 F are termed " hyperpyrexia " and can be seen with brain dysfunction, severe infections, or brain bleeds. An extremely high temperature above 105.8 F sometimes represents hyperthermia, which is different from a fever.

7. People also ask

   Is a fever an illness?

   • Last reviewed on 05/31/2023. Learn more about the Health Library and our editorial process. A fever is when your body temperature rises higher than normal. A fever itself isn’t an illness. Rather, it’s a symptom for a wide range of health conditions.

   Fever Symptoms & Causes: What Is Considered a Fever? - Cleveland Cli…

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   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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   Can you get sick if you have a fever?

   • Better thermometers. We may have more accurate thermometers than people did a century ago. Despite the new research, doctors generally don’t consider you to have a fever until your temperature is at or above 100 F. But you can be sick if it’s lower than that.

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

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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

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8. www.webmd.com › ss › slideshow-what-to-know-feverFever Causes, Symptoms and Treatments - WebMD

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   Jul 18, 2024 · How Fever Affects Your Body. If you have a fever, you may feel hot and sweaty. You also might shiver because you feel chilled. Weakness, aches, or fatigue could happen. You may have symptoms of ...