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Body Temperature

Updated: May 30, 2023

The general guideline for categorizing body temperature based on severity using both Celsius and Fahrenheit scales:

  1. Mild fever: Body temperature between 100.4°F (38°C) and 101.3°F (38.5°C), or between 37.8°C and 38.5°C. This is typically considered a low-grade fever and may not require treatment unless other symptoms are present.

  2. Moderate fever: Body temperature between 101.4°F (38.6°C) and 102.1°F (38.9°C), or between 38.6°C and 39.0°C. This is typically considered a moderate-grade fever and may indicate an infection or illness that requires treatment.

  3. High fever: Body temperature above 102.2°F (39°C), or above 39.0°C. This is typically considered a high-grade fever and may indicate a serious infection or illness that requires prompt medical attention.

Body temperature below 36.5°C (97.7°F) is generally considered to be lower than normal, and this condition is known as hypothermia. Mild hypothermia is defined as a body temperature between 32°C and 35°C (89.6°F to 95°F), moderate hypothermia is between 28°C and 32°C (82.4°F to 89.6°F), and severe hypothermia is below 28°C (82.4°F).

It's important to note that fever severity may vary depending on the individual's age, health status, and other factors. Additionally, hypothermia can be caused by a variety of factors, and treatment may involve rewarming the body slowly and carefully. If you suspect that you or someone else is experiencing hypothermia, it's important to seek medical attention immediately.


  1. Mayo Clinic. (2021). Fever treatment: Quick guide to treating a fever. Retrieved from

  2. Centers for Disease Control and Prevention. (2020). Hypothermia. Retrieved from

  3. Mayo Clinic. (2021). Hypothermia. Retrieved from

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