Fever in Adults: Symptoms, Causes, Treatment & Relief Tips

A fever is when your body temperature rises above its normal temperature range. It’s a sign that your immune system is working properly to fight off causes of the fever such as a cold, flu, or other infection.

Fever grades

A normal body temperature in adults is approximately 98.6 °F, but may fluctuate depending on the time of day or what temperature reading method was used. While any temperature above your normal temperature range is considered a fever, there are different levels of fever severity.

Adult Fever Temperature Range Chart

Adults with a temperature of >98.6°F to 100.4°F are considered to have a low-grade fever. A temperature of 100.4°F to 102.2°F is considered a moderate-grade fever for adults. A high-grade fever for an adult is any temperature above 102.2°F.

*A temperature reading at or above 104°F is called hyperpyrexia and is considered a medical emergency requiring immediate care.

Signs & Symptoms of Fevers in Adults

Overheating
Chills
Achy muscles
Restlessness or Sleeplessness
Weakness
Sweating
Discomfort
Rash
Headache
Decreased appetite

What Causes a Fever in Adults?

A fever is your body’s natural defense against bacterial or viral infection, and is actually an indication that your immune system is doing its job. When you’re sick, your body temperature rises in an attempt to kill the temperature-sensitive bacteria causing the infection. Fevers are most commonly associated with colds & flu and will usually subside on their own within a few days.

Adult Fever Treatment: Tips for Managing Fevers

While most fevers are harmless, it’s important to know how to treat a fever. Talk to your doctor if you have any questions or concerns.

Fluids

Drinking plenty of water can not only prevent dehydration, but can also help lower your body temperature.

Rest

Your body is working on overdrive to fight off infection. Be sure to get plenty of sleep so you can recharge.

Light foods

Eat foods that are easy to digest, like crackers and soup. Avoid dairy products like milk and cheese.

Cool compress

Apply a damp washcloth to your forehead to help lower your temperature.

Pain reliever

Pain relievers containing acetaminophen, such as T YLENOL Extra Strength Rapid Release Gels can help alleviate head and body aches and lower your temperature. TYLENOL^® is the #1 doctor recommended brand of pain reliever.

References

Fever. Cleveland Clinic, https://my.clevelandclinic.org/health/symptoms/10880-fever
5 Methods to Safely Break a Fever. Cleveland Clinic, https://health.clevelandclinic.org/breaking-a-fever
Fever. Mayo Clinic, https://www.mayoclinic.org/diseases-conditions/fever/symptoms-causes/syc-20352759
Fever. Johns Hopkins Medicine, https://www.hopkinsmedicine.org/health/conditions-and-diseases/fever

Links to other parties’ articles and websites are provided for convenience only. Kenvue is not responsible for their content.