Most fevers don’t need aggressive treatment, but when you’re uncomfortable or your temperature climbs above 103°F (39.4°C), a combination of over-the-counter medication, fluids, and simple environmental adjustments can bring it down within 30 to 60 minutes. A fever is your body’s natural defense against infection, so the goal isn’t always to eliminate it completely. It’s to keep yourself or your child comfortable and safe while the immune system does its work.
Why Your Body Runs a Fever
The hypothalamus, a small region at the base of your brain, acts like a thermostat. It normally keeps your body within a degree or two of 98.6°F. When your immune system detects an infection or injury, it releases chemicals that essentially turn the thermostat up. Blood vessels narrow, pulling heat toward your core, and you start to feel cold even though your temperature is rising. That’s why fevers often begin with chills.
This higher temperature makes your body a less hospitable environment for viruses and bacteria, and it speeds up certain immune responses. So a low fever that isn’t causing much discomfort may not need treatment at all. The steps below are for when the fever is making you miserable or reaching a level that warrants action.
Take the Right Over-the-Counter Medication
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the two main options for reducing fever in both adults and children. They work by blocking the chemical signals that tell your hypothalamus to raise your temperature. Most people notice their fever start to drop within 30 to 45 minutes of taking either one.
For adults, acetaminophen can be taken every four to six hours as needed, but you should never exceed 4,000 milligrams (4 grams) in a 24-hour period. Going over that limit puts serious strain on your liver. Ibuprofen is typically taken every six to eight hours. Both are effective, and if one isn’t bringing enough relief, some people alternate between the two, though you should follow the dosing schedule on each package carefully to avoid overlap.
For children, liquid formulations of acetaminophen and ibuprofen are dosed by weight, not age. Check the packaging or ask a pharmacist if you’re unsure. One critical rule: never give aspirin to children or teenagers with a fever. Aspirin has been linked to Reye’s syndrome, a rare but potentially fatal condition that causes swelling in the liver and brain. This risk is highest during viral illnesses like the flu or chickenpox. Aspirin sometimes appears under other names on labels, including acetylsalicylic acid and salicylate, so read ingredients carefully.
Stay Hydrated
Fever increases your metabolic rate and accelerates fluid loss through your skin. For every degree your temperature rises above 100.4°F (38°C), your body loses roughly 10% more fluid than normal through the skin alone. That’s on top of any sweating, which can be substantial.
Water is the simplest choice, but oral rehydration solutions, diluted juice, broth, and electrolyte drinks all help replace what you’re losing. If you’re caring for a child with a fever, offer small sips frequently rather than large amounts at once, since nausea often accompanies higher fevers. Dehydration makes fevers feel worse and can slow recovery, so steady fluid intake is one of the most effective things you can do alongside medication.
Adjust Your Environment and Clothing
Your instinct when feverish may be to pile on blankets, especially during the chills phase. But once the chills pass, bundling up traps heat and can push your temperature higher. Dress in lightweight, breathable clothing and use a single sheet or light blanket for sleeping. Keep the room cool but not cold.
The key is to avoid shivering. Shivering is your body’s way of generating heat, which defeats the purpose. If you strip down too aggressively and start to shiver, you’ll actually raise your core temperature. Find the middle ground: cool enough to let heat escape, warm enough that your body isn’t fighting to produce more.
A lukewarm (not cold) washcloth on the forehead or the back of the neck can provide comfort. Avoid ice baths or very cold water, which trigger shivering and constrict blood vessels near the skin, trapping heat inside.
Rest and Let Your Body Recover
Physical activity generates heat and diverts energy your immune system needs. Rest is not optional when you have a significant fever. Sleep as much as your body asks for. If you’re caring for a feverish child, quiet activities and extra naps are more productive than trying to maintain a normal routine.
Eating may not feel appealing, and that’s fine in the short term. Focus on fluids and eat what you can tolerate. Simple foods like toast, crackers, soup, and fruit are easier on a stomach that may already be unsettled.
When a Fever Needs Medical Attention
In adults, a temperature of 103°F (39.4°C) or higher warrants a call to your healthcare provider, even if you’re otherwise feeling okay. Seek immediate care if a fever comes with any of the following: severe headache, stiff neck (especially pain when bending your head forward), rash, unusual sensitivity to bright light, confusion or altered speech, persistent vomiting, difficulty breathing, chest pain, or seizures.
For children, the thresholds are different and depend heavily on age. Any infant younger than 3 months with a rectal temperature of 100.4°F (38°C) or higher needs prompt medical evaluation, even if the baby looks fine. Between 3 and 6 months, a rectal temperature above 102°F (38.9°C) or unusual irritability and sluggishness at any temperature is a reason to call your pediatrician. For children between 7 and 24 months, a fever above 102°F that persists for more than a day without other symptoms should be evaluated.
In older children, watch for listlessness, poor eye contact, repeated vomiting, or a fever lasting longer than three days. If a child has a seizure associated with a fever (febrile seizures are more common than many parents realize), call 911 if it lasts more than five minutes or the child doesn’t recover quickly.
What Doesn’t Work
Starving a fever has no basis in evidence. Your body needs fuel and fluids to fight infection. Alcohol rubs, once a common home remedy, can cause dangerous drops in body temperature and alcohol absorption through the skin, particularly in children. Cold baths feel logical but trigger shivering, which raises your core temperature and makes you more uncomfortable.
Antibiotics won’t help a fever caused by a virus, which is the cause of most fevers. Taking leftover antibiotics from a previous illness does nothing for viral infections and contributes to antibiotic resistance. If your fever is bacterial in origin, a healthcare provider will prescribe the appropriate treatment after evaluation.