What are the different causes of fever?

Any fever in an infant under one month of age needs immediate medical attention. The problem causing the fever may be due to infection and can be very serious. It is very difficult to know the difference between minor illnesses and more serious illnesses when the child is a newborn. Fever may often be the only sign of an infection.

Fever in a baby between one month and three months of age is still worrisome. Most fever at this age is due to a viral illness. If the baby is not lively or not behaving normally, you should see a doctor right away.

For a baby between three months and one year of age, fever is usually due to a cold or other viral illness. Infants can also develop fever following their immunizations.

For older children aged two to six years of age, the most common cause of fever is a viral illness. Other causes include strep throat, ear infections, pneumonia and infections of the digestive and urinary tract.

In school-age children, viral infections of the respiratory tract are still the most common cause of fever. Strep throat and scarlet fever (strep throat with a rash) are common at this age. Fever can be caused by urinary tract infections, sinusitus, and pneumonia.

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The information provided on this web site is provided for information purposes only. It is not intended as a substitute for professional advice. Please consult your physician with any questions or concerns.