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As per Mayo Clinic, allergies do not result in fevers. However, allergies can cause other conditions, which can at times come along with fever. Also having higher body temperature than normal can be a symptom of another illness that is similar to an allergy.
It is best left to a doctor to figure out the cause of the fever and treat it. In case a person is suffering from an allergy along with fever, the doctor will try to determine what infection is causing fever in the person as allergies do not cause fever.
Any allergy occurs when the immune system of the body comes in contact with an allergen. When this happens, the defense mechanism of the body becomes active and starts fighting off the allergen and this causes many symptoms like runny nose, suffering from congestion of the nose, sneezing, watering of the eyes and rash on the skin. Usually, people who have these symptoms are allergic to some kinds of food, pollen, dust, mold or certain kinds of medications.
When a person has an allergy and also fever, the fever is not caused due to the allergy. Rather it is caused due to a secondary infection that is brought on by the allergic reaction. For instance, if a person has a nasal allergy, he or she can end up with chronic sinusitis. This infection can result in fever as the body is making an attempt to fight the infection.
Many times, it is very difficult to differentiate between an allergy and the common cold. A person may end assuming that he or she is having an allergy when in reality the person could be having a cold. However, there are differences between a cold and an allergy. Usually a cold will last for around 5 to 7 days, whereas an allergy may be present all year long. At times goes, the cold get worse, whereas an allergy comes all of a sudden. Also, when a person has a cold, the discharge from the nose will be thick and yellow in color, while the discharge due to an allergy will be thin and clear.
When a person gets an allergy accompanied with fever, he or she will be treated with the help of antibiotics to combat the secondary infection. In addition, the person may also be prescribed decongestants to help with congestion of the sinuses; and get pain relievers to help with the headache and fever. Once the secondary infection disappears, the fever will also disappear. On the other hand, if a person gets fever due to a cold, what he or she requires is ample best rest and lots of fluid.
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