Fever
Alternative names:
elevated temperature; hyperthermia; pyrexia
Definition:
Normal body temperature
varies with different people, but the average is 98.6 degrees
Fahrenheit (37 degrees Centigrade). If the temperature is
99 to 100 degrees Fahrenheit, suspect a fever; if it is 100
degrees Fahrenheit or above, it is classified as a fever.
Considerations:
Normal body temperature
varies during the day. It is generally lowest upon awakening
in the morning. Food, extra clothing, excitement,
and anxiety can all raise
the body temperature. Strenuous exercise
can temporarily raise body temperature to as high as 103 degrees
Fahrenheit. Extreme exercise, such as a marathon or a seizure,
can raise body temperature to 107 degrees Fahrenheit.
A woman's menstrual cycle can also elevate temperature by
one degree or more.
Most children have higher body temperatures than adults and
seem to have more daily variation. Many infants and children
develop high fevers, even with minor viral illnesses. A high
fever does not directly cause brain damage. However, febrile
seizures can occur in some children, and the seizure
can cause injury to the child.
Fevers are described as low grade (102 degrees Fahrenheit
or lower) or high grade (above 103 Fahrenheit). They are also
described as spiking (the fever suddenly jumps high, then
drops) or cyclic (the fever increases and decreases in a regular
manner).
Bacteria, viruses, or their toxins may be released into the
bloodstream and cause chills and shivering in the patient.
Chills may occur during a temperature spike within a fever.
A heat stroke can result
from too much exercise
without water or salt, and temperature can rise to 106 degrees
Fahrenheit.
Unexplained fevers that continue for days or weeks are referred
to by doctors as fevers of undetermined origin (FUO). Most
are eventually found to be caused by a hidden infection.
Common causes:
- viral and bacterial infections
- colds or flu-like
illnesses
- sore throats and
strep throat
- earaches (otitis
media)
- viral gastroenteritis
or bacterial gastroenteritis
- acute bronchitis
- infectious mononucleosis
- urinary tract infections
- upper respiratory infections
such as tonsillitis,
pharyngitis or laryngitis
- dehydration
- medications such as antibiotics, antihistamines, barbiturates,
and drugs for high blood
pressure
- occasionally, more serious problems like pneumonia,
appendicitis, tuberculosis
(TB), and meningitis
- fever can occur in infants who are overdressed in hot
weather or a hot environment
- collagen vascular disease,
rheumatoid diseases, and autoimmune
disorders
- inflammatory bowel disease
- malignant disorders (cancerous)
Note: There are many other causes of a fever. This list is
not all inclusive, and the causes are not presented in order
of likelihood. The causes of this symptom can include unlikely
diseases and medications. Furthermore, the causes may vary
based on age and gender of the affected person, as well as
on the specific characteristics of the symptom such as quality,
time course, aggravating factors, relieving factors, and associated
complaints.
Update Date: 10/08/99
Updated by: adam.com editorial
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