The fastest way to calm a fever is to take a fever-reducing medication, stay well hydrated, and keep your environment cool without bundling up. A temperature of 100.4°F (38°C) or higher counts as a fever, and while fevers are uncomfortable, they’re your body’s natural defense against infection. Most fevers resolve on their own within a few days with simple home care.
Fever-Reducing Medication
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the two main options. Both lower fever effectively, and choosing between them mostly comes down to what you tolerate well and how often you want to re-dose. Acetaminophen can be taken every 4 to 6 hours, with no more than 5 doses in 24 hours. Ibuprofen is taken every 6 to 8 hours, with a maximum of 4 doses in 24 hours. For children, the correct dose is based on weight, not age.
A few important restrictions: don’t give acetaminophen to infants under 8 weeks old, and don’t give ibuprofen to infants under 6 months old unless a doctor specifically recommends it.
You may have heard that alternating between acetaminophen and ibuprofen brings a fever down faster. The American Academy of Family Physicians advises against this, particularly for children. There’s no evidence the alternating approach works better than either medication alone, and the complicated dosing schedule (every four hours for one, every six for the other) creates real risk of accidentally overdosing. Stick to one medication at a time.
Stay Hydrated
Fever increases the amount of fluid your body loses through the skin. For every degree above 100.4°F, your fluid needs rise by roughly 10%. That adds up quickly if a fever runs for a day or two. Water is the simplest choice, but oral rehydration solutions, broth, and diluted juice all help. For breastfed infants, offer the breast more frequently.
Signs of dehydration to watch for include dark urine, dry lips and mouth, dizziness when standing, and in young children, fewer wet diapers than usual. If you’re having trouble keeping fluids down due to vomiting, take small, frequent sips rather than large amounts at once.
Cool Your Environment, Not Your Body
Keeping the room comfortably cool helps your body release heat naturally. For babies, the recommended room temperature is 60 to 68°F (16 to 20°C). Adults can aim for a similar range or whatever feels comfortable without needing heavy blankets. Dress in light, breathable clothing and use a single light sheet or blanket rather than piling on layers. Babies should not wear hats indoors, since they regulate temperature partly through their heads.
A lukewarm sponge bath can also help. Use water between 90°F and 95°F (32 to 35°C). This is warm enough to be comfortable but still cooler than a feverish body, so it draws heat away gradually. Do not use cold water or ice. Cold triggers shivering, which actually raises your core temperature and works against you.
Never Use Rubbing Alcohol
An old home remedy suggests rubbing isopropyl alcohol on the skin to cool a fever. This is genuinely dangerous, especially for children. Rubbing alcohol absorbs through the skin and enters the bloodstream, where it can cause alcohol poisoning, irregular heartbeat, seizures, and even coma. The Cleveland Clinic warns that these effects can lead to permanent brain damage or death in children, whose smaller bodies are far more vulnerable to absorption.
Taking an Accurate Temperature
Where you place the thermometer affects the reading. A rectal temperature is the most accurate method for babies and young children. Oral readings are the standard reference point for older children and adults, averaging 98.6°F (37°C) when healthy. Ear and rectal readings tend to run about 0.5 to 1°F higher than oral, while armpit and forehead readings tend to run 0.5 to 1°F lower. If you’re using a forehead or armpit thermometer, keep that offset in mind before deciding whether a reading truly qualifies as a fever.
Fever Thresholds by Age
Not every fever needs the same response. The child’s age is the single biggest factor in how urgently you should act:
- Under 3 months: Any fever of 100.4°F (38°C) or higher needs immediate medical attention, even if the baby seems fine otherwise.
- 3 to 6 months: A fever of 102°F (38.9°C) or higher warrants a call to the doctor.
- Over 6 months: Seek medical advice at 103°F (39.4°C) or higher.
For adults, a fever alone is rarely an emergency. What matters more is how you feel, how long the fever lasts, and whether other symptoms appear alongside it.
Febrile Seizures in Children
Febrile seizures are convulsions triggered by fever, most common in children between 6 months and 5 years old, with peak risk between 12 and 18 months. A child having one will typically shake all over, stiffen, and lose consciousness. It looks terrifying, but most febrile seizures end on their own within a minute or two and don’t cause lasting harm.
If your child has a febrile seizure, lay them on their side on a safe surface and time it. Call 911 if the seizure lasts longer than five minutes, or if it’s accompanied by vomiting, a stiff neck, breathing problems, or extreme sleepiness afterward. A first febrile seizure always warrants a follow-up with your child’s doctor, even if it resolves quickly.
Warning Signs That Need Immediate Attention
Most fevers are driven by common infections and pass in a few days. But certain symptoms alongside a fever signal something more serious. Seek immediate medical care if a fever comes with any of the following:
- Severe headache with a stiff neck, especially pain when bending the head forward (a hallmark of meningitis)
- Rash, particularly one that doesn’t fade when you press on it
- Mental confusion, altered speech, or strange behavior
- Persistent vomiting
- Difficulty breathing or chest pain
- Seizures
- Unusual sensitivity to bright light
In children, watch for listlessness, poor eye contact, and inconsolable irritability. A fever lasting longer than three days in a child also warrants medical evaluation, even without other alarming symptoms.