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   What if a fever is too high?

   • As for a fever that's too high, that depends on a couple of other factors. If you're over 65 or immunocompromised — especially if you may have been exposed to COVID-19 — call your doctor if your fever reaches 101°. Anyone with a fever of 103° or higher should do the same. And if your temperature reaches 105°, go straight to an emergency room.

   How high a fever is too high? - Harvard Health

   www.health.harvard.edu/staying-healthy/how-high-a-fever-is-too-high

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   Can a high temperature cause a fever?

   • You may have a fever if your temperature rises above this. 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) or above. Most fevers usually go away by themselves after 1 to 3 days.

   Fever in Adults: Characteristics, Types, and When It's Serious - Healthline

   www.healthline.com/health/cold-flu/fever-in-adults

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   What causes a high fever?

   • A high fever can also be caused by drug reactions, inflammatory diseases, autoimmune disorders, excess heat exposure, and other non-infectious conditions. These conditions cause fever by disrupting the part of the brain that functions as the body's thermostat, called the hypothalamus.

   What Causes a High-Grade Fever and When Is It Too High? - Verywell …

   www.verywellhealth.com/when-is-a-fever-too-high-770347

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

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   May 22, 2023 · 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) Moderate-grade: 100.6 to 102.2 F (38.1 to 39.0 C) High-grade: 102.4 to 105.8 F (39.1 to 41 C).

   • Email: hhp_info@health.harvard.edu

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

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   May 7, 2022 · Symptoms. Body temperatures vary slightly from person to person and at different times of day. 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.

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

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   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...

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

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   Aug 4, 2022 · In fact, most healthy adults can even tolerate a fever as high as 103°F to 104°F for short periods of time without having any significant problems. The body temperature usually returns to normal once the illness resolves. Click here for a list of fever symptoms in adults. Page Contents. What is the difference Between Fever and Hyperthermia?

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

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   Mar 7, 2024 · When using an oral thermometer, 98.6 degrees Fahrenheit (F) is considered a normal body temperature. Anything above 99.1 F is considered a fever in adults and children. A fever is considered high when the temperature is above 103 F in adults. In young children and others, a high fever may be defined differently.

7. www.mayoclinic.org › diseases-conditions › feverFever treatment: Quick guide to treating a fever - Mayo Clinic

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   Feb 26, 2022 · Adults; Age Temperature What to do; 18 years and up: Up to 102 F (38.9 C) taken orally: Rest and drink plenty of fluids. Medication isn't needed. Call the doctor if the fever is accompanied by a severe headache, stiff neck, shortness of breath, or other unusual signs or symptoms. 18 years and up: Above 102 F (38.9 C) taken orally