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  1. Mar 4, 2021 · If a person is experiencing a fever alongside allergy symptoms, such as a runny or stuffy nose, the likely cause is a sinus infection. Additionally, hay fever, or allergic rhinitis, does not...

    • Beth Sissons
  2. May 22, 2023 · High-grade: 102.4 to 105.8 F (39.1 to 41 C). When to worry about fever. If you have a fever over 104°F (40°C), you should call your doctor. Seek medical help right away if you have a fever along with any of these symptoms: seizure; loss of consciousness; confusion; stiff neck; trouble breathing; severe pain anywhere in the body; swelling or ...

    • hhp_info@health.harvard.edu
  3. May 12, 2023 · “Seasonal allergies should not cause a fever,” as a high temperature often signals your body is fighting a bacterial or viral infection, says Jessica Hui, M.D., allergy and immunology physician...

  4. May 17, 2023 · Allergies Don’t Cause a Fever — At Least, Not Directly. Infections like sinusitis, colds, flu and COVID-19 can cause a fever, but allergies aren’t infections. If you have seasonal allergies ...

  5. Aug 4, 2024 · A fever is defined as a body temperature above 100.4°F (38°C). The normal oral temperature for a resting, healthy adult is about 98.6°F (37°C). However, what is considered a “normal” body temperature can vary by one degree based on age, race, and other factors.

  6. Apr 27, 2018 · If your temperature reaches 100.4° F (38° C) or higher, you have a fever, and it’s likely that you have an infection. You should get medical attention soon to begin treatment.

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  8. 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...