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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 · 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

2. www.verywellhealth.com › when-is-a-fever-too-highWhen Is a Fever Too High? - Verywell Health

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   Mar 7, 2024 · Causes of High-Grade Fever. Almost any infection can cause a high-grade fever, particularly if the body has not been exposed to the pathogen before and has no immunity to it. A high fever can also occur if certain infections are left untreated and either get worse or start to affect other organs.

3. www.health.harvard.edu › staying-healthy › how-highHow high a fever is too high? - Harvard Health

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   Jan 1, 2023 · People should call a doctor if their fever reaches 103° F and go to an emergency room if it reaches 105°. A fever is the immune system's response to an infection or invader. Most fevers drop after people take over-the-counter medications.

   • Author: Toni Golen, MD

   • Email: hhp_info@health.harvard.edu

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

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   Sep 17, 2019 · 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. A persistent or recurrent fever may last or...

5. www.healthline.com › health › hyperpyrexiaHyperpyrexia: Definition, Symptoms, Causes, and Treatment

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   May 4, 2018 · Hyperpyrexia, or a very high fever, can indicate an infection or some other serious condition. It's a medical emergency, so seek medical care immediately if you or your child has a fever higher...

6. resources.healthgrades.com › high-feverHigh Fever: Possible Causes and Treatments - Healthgrades

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   Jul 25, 2022 · Symptoms and Conditions. High Fever: Possible Causes and Treatments. Infection. Heat exhaustion. Sepsis. Drug reaction. Noninfectious conditions. Fever of unknown origin. In children. Contacting a doctor. Treatment. FAQ. Summary. A high fever is when body temperature rises above 103ºF (39ºC) in an adult or above 101ºF (38ºC) in a child.

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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

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   Can a high fever make you feel better?

   • By itself, fever is usually harmless, though a high fever can be miserable. These steps may help you feel better: Drink plenty of fluids to help cool your body and prevent dehydration. Eat light foods that are easy to digest. Get plenty of rest.

   Fever in adults: When to worry - Harvard Health

   www.health.harvard.edu/diseases-and-conditions/treating-fever-in-adults

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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

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   Does fever get worse as temperature rises?

   • The symptoms of fever get worse as the temperature rises. Fevers are broadly categorized as being low-grade, moderate-grade, high-grade, and hyperpyrexia. A low-grade fever is defined as an oral temperature of 99.1 to 100.4 F (37.3 to 38 C) in adults.

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

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   Is a fever a sign of a serious illness?

   • In adults a fever is not usually serious or life-threatening. However, sometimes a fever in adults can be a warning signal that something is not right. A high or persistent fever might be a sign of a serious health condition. What is a fever? A fever is normally a short-term rise in temperature that helps your body get rid of illness.

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

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

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   Nov 15, 2023 · A fever is when you have a brief rise in body temperature that’s higher than your normal body temperature. It’s also called a high temperature, hyperthermia, or pyrexia. It's usually a sign your...