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

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   A fever has many causes and can be a symptom of almost any illness. Common conditions that cause fever include: Bacterial infections. Viral infections such as influenza or COVID-19. Gastrointestinal (GI) infections. Urinary tract infections. Skin infections. You may also develop a fever due to: A reaction to certain medications. Vaccinations.

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

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   May 7, 2022 · 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.

3. www.healthline.com › health › cold-fluFever in Adults: Characteristics, Types, and When It's Serious

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   Sep 17, 2019 · Common causes of a fever in adults are: viral infection (like the flu or a cold) bacterial infection. fungal infection. food poisoning. heat exhaustion. serious sunburn. inflammation (from ...

4. www.cdc.gov › common-coldAbout Common Cold | Common Cold | CDC - Centers for Disease ...

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   Oct 15, 2024 · Overview. A cold is a viral infection of the upper respiratory tract (also called an upper respiratory infection or URI). Colds usually last less than a week and are caused by different respiratory viruses. They are also one of the most frequent reasons for missed school and work. Every year in the United States, adults have an average of two ...

5. 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.

   • Author: Colleen Doherty, MD

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

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   May 22, 2023 · Causes of fever. An infection, such as the flu, is the most common cause of fever. Other conditions can also cause a fever. These include diseases that produce inflammation, such as rheumatoid arthritis; reactions to drugs or vaccines; and even certain types of cancers. Accompanying symptoms. The following symptoms may also accompany fever ...

7. 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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   What causes a fever if you have a cold?

   • Flu, bronchitis, and pneumonia are more common causes of fevers. You are considered to have a fever when your temperature reaches 100.5 F. You may have some slight body aches with a cold, but stronger ones are usually a sign that you have the flu. This is because short-term achy muscles often happen along with a fever.

   Cold or More Serious: Flu, Bronchitis, Pneumonia - WebMD

   www.webmd.com/cold-and-flu/ss/slideshow-cold-something-else

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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 does it mean if you have a fever?

   • 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. They typically go away when the infection passes.

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

   my.clevelandclinic.org/health/symptoms/10880-fever

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   Is a fever a disease?

   • Fever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever. What Is Considered a Normal Body Temperature?

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

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8. www.webmd.com › cold-and-flu › ssCold or More Serious: Flu, Bronchitis, Pneumonia - WebMD

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   Jul 24, 2024 · Increase in Temperature. This is a sign that your body is trying to fight an illness or infection, but it's rarely caused by a cold. Flu, bronchitis, and pneumonia are more common causes of fevers ...