Colds rarely cause fevers in adults. A temperature over 100.4°F (38°C) happens occasionally with a cold, but it’s far more common in infants and young children, who frequently develop fevers during the first three days of a cold. If you’re an adult with a significant fever, there’s a good chance you’re dealing with something other than a simple cold.
Why Children Get Fevers With Colds
The difference between adults and children is striking. In adults, fever during a cold is considered rare. In infants and preschool-aged children, fever is a common feature during the first three days of infection. Their immune systems are encountering many cold viruses for the first time, which tends to trigger a stronger inflammatory response. Adults, who have built up partial immunity to hundreds of cold viruses over a lifetime, typically fight off the infection with milder symptoms like congestion, a sore throat, and sneezing.
If your young child has a low-grade fever along with a runny nose and cough, that’s a normal part of a cold. The fever usually resolves within the first 72 hours. A fever that persists beyond three days, or one that climbs above 102°F (38.9°C) in a child between 3 and 24 months old, warrants a call to their pediatrician. For babies under 3 months, any rectal temperature of 100.4°F or higher is reason to contact a provider right away.
Fever vs. Feeling Warm
Many people describe feeling feverish during a cold, even when their actual temperature is normal. Chills, body aches, and general malaise can create that “feverish” sensation without your temperature rising above the threshold. This is your immune system ramping up its response to the virus. If you’re unsure, a thermometer is the only reliable way to tell. An oral temperature of 100°F (37.8°C) or higher generally counts as a true fever.
Cold, Flu, or COVID-19
Fever is one of the most useful clues for telling these infections apart. With a cold, fever is rare. With the flu, fever is usual and often arrives suddenly alongside body aches, fatigue, and a dry cough. COVID-19 falls somewhere in between, with fever occurring sometimes.
Timing also helps. Cold symptoms typically appear one to three days after exposure and build gradually, starting with a scratchy throat and progressing to congestion. Flu symptoms hit faster and harder, showing up one to four days after exposure with a rapid onset of high fever and exhaustion. COVID-19 has the widest window, with symptoms starting anywhere from two to 14 days after exposure.
If you have a fever above 101°F, significant body aches, and fatigue that keeps you in bed, you’re more likely dealing with the flu or COVID-19 than a cold. A home test or a visit to a clinic can help you sort it out, especially since treatments for the flu and COVID-19 work best when started early.
When a Fever During a Cold Is Concerning
Fevers below 104°F that accompany common viral infections generally help your immune system fight off the virus. They’re uncomfortable but not dangerous on their own. A fever becomes more concerning when it lasts longer than three days, returns after it had already gone away, or is accompanied by symptoms that don’t fit a typical cold: confusion, a severe headache, repeated vomiting, or difficulty breathing. These patterns can signal a secondary bacterial infection like pneumonia or sinusitis, which sometimes develops after a cold weakens your respiratory defenses.
In children, watch for listlessness, poor eye contact, persistent irritability, or a fever that won’t come down. These signs matter more than the exact number on the thermometer.
Managing a Mild Fever
If you or your child does develop a low-grade fever with a cold, you don’t necessarily need to treat it. The fever itself is part of the immune response. But if it’s making you miserable, ibuprofen is more effective than acetaminophen at reducing fever-related discomfort in both adults and children. Ibuprofen also helps with headache, ear pain, and muscle aches that sometimes tag along with a cold. Acetaminophen can offer short-term relief from congestion and a runny nose but doesn’t do much for sore throat, sneezing, or cough.
For children, alternating between ibuprofen and acetaminophen can be effective at keeping fever-related discomfort under control. Over-the-counter cold medications should not be used in children under four years old, as they carry potential harms without proven benefit in that age group.
Beyond medication, staying hydrated and resting are the most effective things you can do. A cold with a mild fever typically resolves on its own within seven to ten days, with the worst symptoms concentrated in the first three or four.