A simple cold or other viral infection can sometimes cause a high fever (102 - 104 °F, or 38.9 - 40 °C). This does not usually mean you or your child have a serious problem. Some serious infections may cause no fever or even a very low body temperature, especially in infants.

If the fever is mild and you have no other problems, you do not need treatment. Drink fluids and rest.

The illness is probably not serious if your child:

• Is still interested in playing
• Is eating and drinking well
• Is alert and smiling at you
• Has a normal skin color
• Looks well when their temperature comes down

Take steps to lower a fever if you or your child is uncomfortable, vomiting, dried out (dehydrated), or not sleeping well. Remember, the goal is to lower, not eliminate, the fever.

When trying to lower a fever:

• Do NOT bundle up someone who has the chills.
• Remove excess clothing or blankets. The room should be comfortable, not too hot or cool. Try one layer of lightweight clothing, and one lightweight blanket for sleep. If the room is hot or stuffy, a fan may help.
• A lukewarm bath or sponge bath may help cool someone with a fever. This is especially effective after medication is given -- otherwise the temperature might bounce right back up.
• Do NOT use cold baths, ice, or alcohol rubs. These cool the skin, but often make the situation worse by causing shivering, which raises the core body temperature.

Here are some guidelines for taking medicine to lower a fever:

• Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) help reduce fever in children and adults. Sometimes doctors advise you to use both types of medicine.
• Take acetaminophen every 4 - 6 hours. It works by turning down the brain's thermostat.
• Take ibuprofen every 6 - 8 hours. DO NOT use ibuprofen in children younger than 6 months old.
• Aspirin is very effective for treating fever in adults. DO NOT give aspirin to a child unless your child's doctor tells you to.
• Know how much you or your child weighs, and then always check the instructions on the package.
• In children under age 3 months, call your doctor first before giving medicines.

Eating and drinking with a fever:

• Everyone, especially children, should drink plenty of fluids. Water, popsicles, soup, and gelatin are all good choices.
• Do not give too much fruit or apple juice and avoid sports drinks in younger children.
• Although eating foods with a fever is fine, do not force foods.

Call a doctor right away if your child:

• Is younger than 3 months old and has a rectal temperature of 100.4 °F (38 °C) or higher
• Is 3 -12 months old and has a fever of 102.2 °F (39 °C) or higher
• Is under age 2 and has a fever that lasts longer than 24 - 48 hours
• Is older and has a fever for longer than 48 - 72 hours
• Has a fever over 105 °F (40.5 °C), unless it comes down readily with treatment and the person is comfortable
• Has other symptoms that suggest an illness may need to be treated, such as a sore throat, earache, or cough
• Has been having fevers come and go for up to a week or more, even if they are not very high
• Has a serious medical illness, such as a heart problem, sickle cell anemia, diabetes, or cystic fibrosis
• Recently had an immunization
• Has a new rash or bruises appear
• Has pain with urination
• Has trouble with the immune system (chronic steroid therapy, after a bone marrow or organ transplant, spleen was removed, is HIV-positive, or is being treated for cancer)
• Has recently traveled to a third world country

Call 911 if you or your child has a fever and:

• Is crying and cannot be calmed down (children)
• Cannot be awakened easily or at all
• Seems confused
• Cannot walk
• Has difficulty breathing, even after their nose is cleared
• Has blue lips, tongue, or nails
• Has a very bad headache
• Has a stiff neck
• Refuses to move an arm or leg (children)
• Has a seizure

Call your doctor right away if you are an adult and you:

• Have a fever over 105 °F (40.5 °C), unless it comes down readily with treatment and you are comfortable
• Have a fever that stays at or keeps rising above 103 °F
• Have a fever for longer than 48 - 72 hours
• Have had fevers come and go for up to a week or more, even if they are not very high
• Have a serious medical illness, such as a heart problem, sickle cell anemia, diabetes, cystic fibrosis, COPD, or other chronic lung problems
• Have a new rash or bruises appear
• Have pain with urination
• Have trouble with your immune system (chronic steroid therapy, after a bone marrow or organ transplant, had spleen removed, HIV-positive, were being treated for cancer)
• Have recently traveled to a third world country

Your doctor will perform a physical examination, which may include a detailed examination of the skin, eyes, ears, nose, throat, neck, chest, and abdomen to look for the cause of the fever.

Treatment depends on the duration and cause of the fever, as well as your other symptoms.

The following tests may be performed:

• Blood studies, such as a CBC or blood differential
• Urinalysis
• X-ray of the chest