An oral temperature above 98.6 degrees Fahrenheit but below 100.4 degrees Fahrenheit is a low-grade fever. A fever can be symptomatic of many conditions, and the low-grade variety is often not cause for concern. However, any fever that persists for more than 24 hours warrants a doctor visit if the cause is undetermined.
Allergies trigger the release of a chemical called histamine, which the body unleashes to attack substances it deems irritating or injurious. Histamine affects the hypothalamus, a region of the brain that is responsible for regulating body temperature, which is why allergies induce a low-grade fever in some people.
This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.