Most fevers don’t need aggressive treatment, but they can make you miserable. The most effective ways to soothe a fever combine over-the-counter medication with simple comfort measures: staying hydrated, keeping your environment cool, and resting. A typical fever from a viral infection lasts 3 to 5 days, though some can stretch beyond a week depending on the virus.
Why Your Body Creates 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 travel to the temperature-control center in your brain. These signals trigger the production of prostaglandins, which raise your body’s “set point” the way you’d turn up a thermostat dial. Your brain then treats your normal temperature as too cold, so it generates heat through shivering and conserves heat by narrowing blood vessels near your skin. That’s why you feel chilled even though your temperature is climbing.
This elevated temperature actually helps your immune system work more efficiently. It speeds up the activity of infection-fighting cells and makes it harder for some pathogens to reproduce. That’s why many doctors don’t recommend treating a mild fever aggressively. The goal of soothing a fever is comfort, not necessarily eliminating it entirely.
Over-the-Counter Fever Reducers
The two main options are acetaminophen (Tylenol) and ibuprofen (Advil, Motrin). Both lower fever by blocking the prostaglandins that raise your body’s set point. They work differently enough that your doctor may suggest alternating them for stubborn fevers, but for most situations, either one alone is sufficient.
Acetaminophen can be taken every 4 to 6 hours. Ibuprofen is dosed every 6 to 8 hours. For children, dosing is based on weight rather than age, so check the package carefully or ask your pharmacist. Ibuprofen is not recommended for babies under 6 months, while acetaminophen can be used in infants over 2 months. For adults, standard doses are two 325 mg acetaminophen tablets or one 200 mg ibuprofen tablet per dose, though always follow label directions for your specific product.
One important note: don’t give aspirin to children or teenagers with a fever. It’s linked to a rare but serious condition called Reye’s syndrome that affects the brain and liver.
Staying Hydrated
Fever increases your body’s energy expenditure by roughly 11% for every degree Celsius your temperature rises. That extra metabolic work burns through fluids faster than normal, and you lose additional water through sweat and rapid breathing. Dehydration is one of the biggest risks of a prolonged fever, and it will make you feel significantly worse.
Adults generally need 2 to 3 liters of water daily under normal conditions, and you should drink more than that when feverish. Water is fine for most people, but if you’ve been vomiting or have diarrhea alongside your fever, an oral rehydration solution or electrolyte drink helps replace lost salts. Aim for small, frequent sips rather than forcing down large amounts at once, especially if your stomach is unsettled.
Watch for early signs of dehydration: increased thirst, dry mouth, dark urine, and decreased urination. More concerning signs include dizziness, muscle weakness, heart palpitations, and confusion. In children, look for fewer wet diapers, no tears when crying, and a sunken soft spot on an infant’s head.
Clothing, Blankets, and Room Temperature
Your instinct when you have chills is to pile on blankets, and a light layer is fine if you’re uncomfortable. But burying yourself under heavy quilts can trap heat and push your temperature even higher. It also increases sweating, which worsens dehydration. Use one light blanket if you need it, and remove layers once the chills pass and you start feeling warm.
Keep your room comfortably cool. Lightweight, breathable clothing works better than heavy pajamas. If you’re sweating, change into dry clothes rather than staying in damp ones, which can make you feel clammy and uncomfortable as your temperature fluctuates.
What Not to Do
Rubbing alcohol baths are an old home remedy that should be avoided entirely. Isopropyl alcohol can be absorbed through the skin, and accidental poisoning has been reported when large amounts were used on the body. This is especially dangerous for children.
Tepid sponge baths, once a standard recommendation, have also fallen out of favor. The UK’s National Institute for Health and Care Excellence strongly recommends against tepid sponging for feverish children, and reviews of the evidence in tropical settings reached the same conclusion. Sponging can trigger shivering, which actually raises body temperature further, working against the cooling you’re trying to achieve. If you find a cool washcloth on the forehead comforting, that’s fine for comfort, but it won’t meaningfully reduce your fever.
Ice baths and cold water immersion are also counterproductive for the same reason. Your body responds to the sudden cold by constricting blood vessels and generating more heat.
Eating During a Fever
Your body’s metabolic rate climbs substantially during a fever, and infection itself increases protein and energy demands while simultaneously reducing your gut’s ability to absorb nutrients efficiently. You don’t need to force yourself to eat full meals, but try to take in some calories. Broth, toast, crackers, fruit, and other easy-to-digest foods help keep your energy up without stressing your digestive system. Warm liquids like broth do double duty by providing both calories and hydration.
How Long a Fever Typically Lasts
Most fevers from common respiratory viruses resolve within 3 to 5 days. However, more than 30% of children with certain viral infections run fevers lasting 5 days or longer. Adenovirus infections can produce fevers lasting over a week, while other viruses like parainfluenza tend to cause shorter episodes. The trajectory matters more than the exact number of days. A fever that’s gradually trending downward is a good sign, even if it hasn’t fully resolved yet.
Warning Signs That Need Medical Attention
In Adults
A temperature of 103°F (39.4°C) or higher warrants a call to your doctor. Seek immediate care if a fever comes with any of these symptoms: severe headache, stiff neck, rash, sensitivity to bright light, confusion or altered speech, persistent vomiting, difficulty breathing, chest pain, abdominal pain, pain when urinating, or seizures. These can signal infections like meningitis, sepsis, or other conditions that need urgent treatment.
In Children
Any fever of 100.4°F (38°C) or higher in a baby younger than 3 months requires immediate medical attention. In this age group, fever can be the only visible sign of a serious infection. For children under 2, a fever lasting more than 24 hours should be evaluated. For children 2 and older, the threshold extends to 3 days. At any age, repeated fevers above 104°F (40°C), inconsolable crying, or unusual lethargy are reasons to seek care promptly.