Most fevers don’t need aggressive treatment, but simple steps like staying hydrated, resting, and using over-the-counter medications can bring your temperature down and help you feel more comfortable. For adults, fevers below 103°F (39.4°C) are generally not dangerous. For children, the threshold for calling a doctor is typically 104°F (40°C), and any fever in a baby under 3 months old warrants an immediate trip to the emergency room.
Why Your Body Runs a Fever
A fever isn’t a malfunction. It’s your immune system deliberately raising your internal thermostat. When your body detects an infection, immune cells release signaling molecules that act on the brain’s temperature control center. This triggers a chain reaction: blood vessels near the skin constrict to hold in heat, and sometimes you start shivering to generate more warmth. Your temperature keeps climbing until it reaches the new, higher set point your brain has established.
This process is driven largely by a compound called prostaglandin E2. That detail matters because the most common fever-reducing medications work by blocking prostaglandin production, which is why they’re effective at lowering the thermostat back toward normal. Understanding this helps explain why cooling measures alone (like a cold cloth) sometimes aren’t enough: your brain is actively working to keep the temperature elevated until the chemical signal changes.
Stay Hydrated
Fever increases fluid loss through sweat and faster breathing, so dehydration can set in quickly. Drink water, clear broth, or diluted juice throughout the day. You don’t need to force large amounts at once. Frequent small sips work well, especially if nausea is an issue.
For babies under 1 year old, an oral rehydration solution like Pedialyte is a better choice than water or juice. These are formulated with the right balance of water, salt, and sugar to replace what a feverish infant loses. Older children and adults can rely on water and broth for most mild fevers, but if vomiting or diarrhea accompanies the fever, an electrolyte drink helps prevent a more serious fluid deficit.
Over-the-Counter Fever Reducers
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the two main options for bringing down a fever. Both block the prostaglandin production that drives your body’s thermostat upward. They differ mainly in timing: acetaminophen can be taken every 4 to 6 hours (no more than 5 doses in 24 hours), while ibuprofen is taken every 6 to 8 hours (no more than 4 doses in 24 hours).
For children, dosing is based on weight, not age. Check the product packaging carefully, because children’s formulations come in different concentrations. A liquid meant for infants is more concentrated than one designed for older kids, and mixing them up can lead to underdosing or overdosing.
Should You Alternate Medications?
Some parents alternate acetaminophen and ibuprofen to keep a child’s fever down more consistently. The American Academy of Pediatrics notes that while this approach may keep the temperature lower for longer stretches, there’s no evidence it actually improves how the child feels or recovers. More importantly, juggling two medications with different dosing schedules increases the risk of giving the wrong dose at the wrong time. If you do alternate, keep a written log of exactly what you gave and when.
Never Give Aspirin to Children
Aspirin use during a viral illness in children and teenagers is linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. The exact mechanism isn’t fully understood, but the association is strong enough that aspirin should not be given to anyone under 18 who has a fever. Stick with acetaminophen or ibuprofen instead.
Lukewarm Sponging and Baths
A lukewarm (not cold) sponge bath is one of the oldest home remedies for fever, and it does work. Gently wiping the skin with a damp cloth or sitting in a shallow lukewarm bath allows heat to transfer from your body into the water and surrounding air. One clinical study in children under 5 found that 20 minutes of lukewarm sponging reduced body temperature by about 1.4°C (roughly 2.5°F), bringing average temperatures from 38.3°C down to 37.2°C.
The key word is lukewarm. Cold water or ice baths cause shivering, which actually raises your core temperature because your body fights the sudden chill by generating more heat. Rubbing alcohol sponge baths, an old folk remedy, should be avoided entirely since the fumes can be harmful, especially for children. If sponging makes someone uncomfortable or causes visible shivering, stop.
Rest and Comfortable Surroundings
Your body is spending significant energy fighting an infection, and rest lets it direct that energy where it’s needed. Wear lightweight, breathable clothing and use a light blanket rather than piling on layers. A warm room might feel comforting when you have chills, but an overly hot environment makes it harder for your body to shed excess heat once the fever starts breaking.
You don’t need to “sweat out” a fever. That idea has no basis in how fevers actually work. Your temperature will drop on its own once your immune system dials back the prostaglandin signal, or when a fever reducer kicks in. Bundling up in heavy blankets just traps heat and can push your temperature higher.
When a Fever Needs Medical Attention
For adults, a fever over 104°F (40°C) warrants a call to your doctor. Seek immediate help if the fever comes with confusion, seizures, loss of consciousness, a stiff neck, trouble breathing, or severe pain anywhere in the body. A fever lasting more than a few days, even at moderate levels, also deserves a medical evaluation.
For children older than 3 months, contact your pediatrician if the fever exceeds 104°F, if the child is inconsolable, difficult to wake, or has a stiff neck, severe headache, or a rash accompanying the fever. Children with immune system conditions or those taking steroids need earlier medical attention.
For infants under 3 months, any fever at all is an emergency. Their immune systems are immature enough that even a low-grade fever can signal a serious infection. Don’t wait to see if it resolves on its own. Go to the emergency room.