A fever is your body’s way of fighting infection, and most fevers resolve on their own within a few days with basic care at home. The standard threshold is 100.4°F (38°C) measured orally, though temperatures between 99.5°F and 100.3°F are considered a low-grade fever. What you need to do depends on how high the fever is, how long it lasts, and who has it.
Why Your Body Runs a Fever
A fever isn’t the illness itself. It’s a deliberate immune response. When your body detects a virus or bacteria, it raises its internal temperature to create a hostile environment for the invader. That higher temperature makes it uncomfortable for the pathogen to survive and replicate. At the same time, your white blood cells become more active and respond faster in warmer conditions, so your immune system is genuinely more effective during a fever.
This is why mild fevers don’t always need to be treated aggressively. Bringing the temperature down can make you more comfortable, but it doesn’t necessarily speed up recovery. The goal of home care is to keep yourself hydrated, rested, and comfortable while your immune system does its work.
Home Care That Actually Helps
Hydration is the single most important thing. Fever increases fluid loss, and dehydration will make you feel significantly worse. Drink water, diluted juice, or broth steadily throughout the day. Don’t wait until you feel thirsty. For infants under one year, an oral rehydration solution like Pedialyte is a better choice than water or juice because it replaces both fluids and electrolytes in the right proportions.
Keep your environment cool. Wear light clothing, lower the room temperature if you can, and sleep with just a sheet or light blanket. Bundling up in heavy covers might feel instinctive when you have chills, but it traps heat and can push your temperature higher. A lukewarm (not cold) sponge bath can help if you’re very uncomfortable. Avoid ice baths or rubbing alcohol on the skin, which can cause shivering and actually raise your core temperature.
Rest matters more than it sounds. Your body is burning extra energy to maintain that elevated temperature and run an immune response. Sleep as much as you can, and don’t push through a workout or a full workday if you can avoid it.
Over-the-Counter Fever Reducers
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the two standard options for bringing down a fever and relieving the aches that come with it. For adults, typical dosing is 500 to 1,000 mg of acetaminophen every four to six hours, with a daily maximum of 3,000 to 4,000 mg depending on the product. Ibuprofen runs 200 to 400 mg every six to eight hours, with an over-the-counter daily max of 1,200 mg.
You can alternate between the two if one alone isn’t providing enough relief. Just track what you took and when so you don’t accidentally double up. Always check the label on combination products like cold medicines, which often contain acetaminophen already.
For children, dosing is based on weight, not age. Follow the packaging instructions carefully or check with a pharmacist if you’re unsure. One critical rule: never give aspirin to children or teenagers. Aspirin has been linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. It typically strikes after a viral infection like the flu or chickenpox and can be fatal without prompt treatment. Children’s acetaminophen and children’s ibuprofen are safe alternatives.
Taking Your Temperature Accurately
Rectal thermometers give the most accurate reading, but they’re invasive and mainly used for infants. Oral thermometers are the standard for older children and adults. Temporal (forehead) and tympanic (ear) thermometers are convenient but can vary slightly in accuracy. The most important thing is consistency: use the same method each time so you can track whether your fever is rising, holding steady, or coming down. Comparing a forehead reading to an oral reading from an hour ago won’t tell you much, because temperatures naturally differ by measurement site.
If you’ve just had a hot or cold drink, wait 15 minutes before taking an oral reading. For the most reliable picture, check your temperature at the same times each day.
Fever Thresholds for Infants and Children
Babies under three months old need medical attention for any rectal or forehead temperature of 100.4°F (38°C) or higher. Their immune systems are immature, and fever at this age can signal a serious infection that needs rapid evaluation. Don’t take a wait-and-see approach with a newborn.
For children between 3 months and 3 years, the concern threshold is higher: a rectal or forehead temperature of 102°F (38.9°C) or above. For children of any age, a temperature hitting 104°F (40°C) warrants a call to the doctor regardless of other symptoms. Pay attention to behavior as much as the number on the thermometer. A child with 101°F who is listless, refusing fluids, or inconsolable is more concerning than a child with 102°F who is still playing and drinking normally.
Warning Signs That Need Medical Attention
Most adult fevers under 104°F can be managed at home for a few days. Call your doctor if your fever reaches 104°F (40°C) or doesn’t improve after about three days.
Certain symptoms alongside a fever point to something more serious and require prompt medical care:
- Stiff neck, which can indicate meningitis
- Confusion or altered consciousness
- Seizure
- Trouble breathing
- Severe pain anywhere in the body
- Swelling or inflammation in any part of the body
- Painful urination or foul-smelling urine, suggesting a urinary tract infection
- Discolored or foul-smelling vaginal discharge
A fever in someone with a weakened immune system, whether from chemotherapy, an organ transplant, or a condition like HIV, also warrants earlier medical contact. The usual “wait a few days” approach doesn’t apply when the body’s defenses are already compromised.