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However, a moderate fever may be slightly dangerous for adults with a heart or lung disorder because fever causes heart rate and breathing rate to increase. Fever can also worsen mental status in people with dementia. Extreme temperature elevation (typically more than 105.8Â° F, or 41Â° C) may be damaging.
Knowing When to Go to the Doctor. 1  1. Recognize the symptoms of a fever. Not everyoneâs normal body temperature is exactly 98.6 Â°F (37.0 Â°C). 2  2. Call the doctor if the fever is high. Adults should go to the doctor with a fever higher than 103 Â°F (39 Â°C). 3  3. Call the doctor if the fever lasts more than a few days.