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

    May 22, 2023 · 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. High fever in adults. While any temperature above your normal temperature range is considered a fever, there are different levels of fever severity: Low-grade: 99.1 to 100.4 F (37.3 to 38.0 C)

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

    Sep 17, 2019 · Adults typically have a fever if their body temperature increases to 100.4°F (38°C). This is called a low grade fever. A high grade fever happens when your body temperature is 103°F (39.4°C ...

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  4. www.verywellhealth.com › when-is-a-fever-too-highWhat Causes a High-Grade Fever and When Is It Too High?

    Mar 7, 2024 · A high fever can also occur if certain infections are left untreated and either get worse or start to affect other organs. Infectious causes of high fever include: Appendicitis (inflammation of the appendix) Cellulitis (a skin infection in deeper skin layers) Encephalitis (inflammation of the brain)

  5. resources.healthgrades.com › high-feverHigh Fever: Causes and Treatments for a High Temperature

    Jul 25, 2022 · A high fever is a body temperate of 103ºF (39ºC) or higher in an adult. In a child, a temperature of 101ºF (38ºC) or higher is a high fever. Causes of a high fever include infections, heat exhaustion, sepsis, and noninfectious conditions, particularly those that affect the immune system. Contact a doctor if you or your child has a high ...

  6. www.healthpages.org › health-a-z › fever-adults100, 101 or 102 Degree Fever? Adult Guide to High Temperatures

    Aug 4, 2024 · A fever is defined as a body temperature above 100.4°F (38°C). The normal oral temperature for a resting, healthy adult is about 98.6°F (37°C). However, what is considered a “normal” body temperature can vary by one degree based on age, race, and other factors. For example, an individual who is over 70 years old may have a lower normal ...

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

    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.

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

    May 7, 2022 · The average temperature has traditionally been defined as 98.6 F (37 C). A temperature taken using a mouth thermometer (oral temperature) that's 100 F (37.8 C) or higher is generally considered to be a fever. Depending on what's causing a fever, other fever signs and symptoms may include: Sweating. Chills and shivering.