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  1. Fever - Symptoms & causes - Mayo Clinic

    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 …

  2. Fever - Johns Hopkins Medicine

    A fever is a body temperature that is higher than normal. It usually means there is an abnormal process occurring in the body.

  3. Fever Symptoms & Causes: What Is Considered a Fever?

    May 31, 2023 · A fever is when your body temperature rises higher than normal. Learn more about fevers including what providers consider a real fever.

  4. Fever Symptoms & Causes: What Is Considered a Fever? - WebMD

    Jun 20, 2024 · A fever is when your body temperature is higher than your normal average temp. Learn how to take temperature, fever types, symptoms, causes, and treatments.

  5. Fever - Penn Medicine

    Jul 31, 2024 · Fever is an important part of the body's defense against infection. Most bacteria and viruses that cause infections in people thrive best at 98.6°F (37°C). Many infants and children …

  6. Fever - MedlinePlus

    Jul 27, 2025 · A fever is a body temperature that is higher than normal. A normal temperature can vary from person to person, but it is usually around 98.6 °F (37 °C). A fever is not a disease. It is usually a …

  7. Fever: Symptoms, treatments, types, and causes - Medical News Today

    May 30, 2025 · A person has a fever when their temperature is higher than 100°F (38°C). Learn about fever types, symptoms, causes, and treatments in this article.

  8. Fever: Symptoms & Causes | NewYork-Presbyterian

    Fever symptoms vary depending on the type of fever, the temperature, and the cause. A fever in adults can produce different symptoms than children may have. Beyond an elevated body temperature, …

  9. Fever Symptoms, Causes, Temperature, Types & Home Remedies

    Get the facts on severe fever treatment (in children and adults) and symptoms. Learn about causes of fever, home remedies to bring down a high fever, ways to prevent fever, and find out when to call a …

  10. Fever: Temperature Range, What’s Serious, Breaking It

    Sep 3, 2025 · Fever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious …