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   Can a disease cause a fever?

   • Many disorders can cause fever. They are broadly categorized as An infectious cause is highly likely in adults with a fever that lasts 4 days or less. A noninfectious cause is more likely to cause fever that lasts a long time or returns. Many cancers cause fever.

   Fever in Adults - Infections - Merck Manual Consumer Version

   www.merckmanuals.com/home/infections/biology-of-infectious-disease/fever-in-adults

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   Is a moderate fever dangerous?

   • However, a moderate fever may be slightly dangerous for adults with a heart or lung disorder because fever causes the heart rate and breathing rate to increase. Fever can also worsen mental status in people with dementia. Extreme temperature elevation (typically more than 105.8° F, or 41° C) may be damaging.

   Fever in Adults - Infections - Merck Manual Consumer Version

   www.merckmanuals.com/home/infections/biology-of-infectious-disease/fever-in-adults

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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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2. www.health.harvard.edu › diseases-and-conditionsFever 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).

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3. www.merckmanuals.com › fever-in-adultsFever in Adults - Infections - Merck Manual Consumer Version

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   However, older people with a fever are more likely to have a serious bacterial infection than are younger adults with a fever. As in younger adults, the cause is commonly a respiratory or urinary tract infection. Skin and soft-tissue infections are also common causes in older people.

   • Author: Larry M. Bush

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

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   Sep 17, 2019 · Characteristics. Types. When it's serious. Causes. Treatments. When to go to the ER. Takeaway. You may need to get plenty of rest and drink fluids to help your body heal. But if you have a high...

5. www.mayoclinic.org › diseases-conditions › feverFever - Symptoms & 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.

6. www.merckmanuals.com › feverFever - Infectious Diseases - Merck Manual Professional Edition

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   Older adults, particularly those in nursing homes, are at particular risk of serious bacterial or viral (eg, COVID-19) infection (see Geriatrics Essentials: Fever). Localizing findings identified by history or physical examination are evaluated and interpreted (see elsewhere in THE MANUAL).

   • Author: Larry M. Bush

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

   my.clevelandclinic.org › health › symptoms

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   May 31, 2023 · 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.

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

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   Nov 15, 2023 · Adults. 100.4 F (oral temperature) A low-grade fever is when you have a temperature that is slightly higher than normal, usually around 99.5 to 100.3 F. A low-grade fever signals that something...