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   What causes a high temperature?

   • Many things can cause a high temperature. It's not usually a sign of anything serious. It's often just caused by your body fighting an infection, such as a cold or flu. Sometimes it could be a sign of something more serious if your temperature is very high or will not come down. This page is for adults.

   High temperature (fever) in adults - NHS

   www.nhs.uk/conditions/fever-in-adults/

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   What is a high body temperature?

   • 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. While any temperature above your normal temperature range is considered a fever, there are different levels of fever severity:

   Fever in adults: when to worry - Harvard Health

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

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   Why is my body temperature so high in the morning?

   • It can be lower in the morning and higher in the late afternoon and evening. When your immune system responds to disease, the hypothalamus can set your body temperature higher. This prompts complex processes that produce more heat and restrict heat loss.

   Fever - Symptoms & causes - Mayo Clinic

   www.mayoclinic.org/diseases-conditions/fever/symptoms-causes/syc-20352759

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2. www.mayoclinic.org › symptoms-causes › syc-20352759Fever - Symptoms & causes - Mayo Clinic

   www.mayoclinic.org › symptoms-causes › syc-20352759

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

   www.health.harvard.edu › treating-fever-in-adults

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

   www.healthline.com › health › cold-flu

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   Sep 17, 2019 · A high grade fever happens when your body temperature is 103°F (39.4°C) or above. ... This may help your doctor find out the cause. Common causes of a fever in adults are: ... A high fever can ...

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

   www.verywellhealth.com › when-is-a-fever-too-high

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   Mar 7, 2024 · 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.

6. www.nhs.uk › conditions › fever-in-adultsHigh temperature (fever) in adults - NHS

   www.nhs.uk › conditions › fever-in-adults

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   Causes of a high temperature. Many things can cause a high temperature. It's not usually a sign of anything serious. It's often just caused by your body fighting an infection, such as a cold or flu. Sometimes it could be a sign of something more serious if your temperature is very high or will not come down.

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

   www.webmd.com › first-aid › fevers-causes-symptoms

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   Nov 16, 2023 · Normal body temperatures are different for everyone, but they lie within the range of 97 to 99. A temperature of 100.4 or higher is considered a fever.

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

   www.healthgrades.com › high-fever

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   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.