![]() ![]() However, it is important to keep in mind that, in the elderly, temperatures below 100.4 may also be indicative of a fever. While there are numerous definitions of fever or pyrexia, the CDC defines a fever as a temperature above 100.4☏ (38☌). Insufficient hydration can also increase the risk of hyperthermia. This most commonly occurs during exposure to extreme heat such as when exercising in hot outdoor temperatures. The hypothalamus functions normally, but the body’s ability to get rid of heat is impaired. Hyperthermia is defined as a sustained body temperature above 104☏ (40☌), and is just another word for overheating. The terms fever and hyperthermia are commonly confused, and are completely different entities. What is the difference Between Fever and Hyperthermia? Ranges in Body Temperatures Symptoms of Fever How to Take Your Temperature - Fever in Adults How to Take Your Temperature - Fever in Children How to Take Your Temperature - Thermometers Mercury Thermometer Digital Thermometers Fever in adults - How to Treat a Fever When to Call Your Doctor Treatment of Hyperthermia Fever in Newborns and Children What is the difference Between Fever and Hyperthermia? Click here for a list of fever symptoms in adults. The body temperature usually returns to normal once the illness resolves. ![]() In fact, most healthy adults can even tolerate a fever as high as 103☏ to 104☏ for short periods of time without having any significant problems. Although it may not be comfortable, a temperature of up to 102☏ is generally safe in adults. In this way, the hypothalamus responds to an infection or inflammation by helping the immune system to defeat the offending agent. It can raise the body’s internal thermostat to combat illnesses. ![]() A fever itself, however, is merely a symptom, and not a disease.Ī brain structure called the hypothalamus sets body temperature, and produces a fever response. Less commonly, certain medications are associated with fevers. It may also be associated with certain autoimmune diseases. It may occur in the presence of an underlying illness such as an infection, malignancy, or even bodily injury. In general, a fever indicates the presence of inflammation. Furthermore, a person’s temperature may increase or decrease by 1 to 2 degrees throughout the day depending on time of day, activity level, the environment (hot or cold), hydration status, or even medications that he/she may be taking. For example, an individual who is over 70 years old may have a lower normal temp at 96.8☏ (36☌). However, what is considered a “normal” body temperature can vary by one degree based on age, race, and other factors. The normal oral temperature for a resting, healthy adult is about 98.6☏ (37☌). A fever is defined as a body temperature above 100.4☏ (38.3☌). ![]()
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