What is considered a low-grade fever?

Author: Emiliano Frami  |  Last update: Sunday, April 12, 2026

There's no standard low-grade fever range. But many healthcare providers consider a body temperature between 99.5 degrees Fahrenheit (37.5 degrees Celsius) and 100.3 degrees Fahrenheit (37.9 degrees Celsius) to be a low-grade fever.

Is 99 a low-grade fever?

Some experts define a low-grade fever as a temperature that falls between 99.5°F (37.5°C) and 100.3°F (38.3°C). According to the U.S. Centers for Disease Control and Prevention (CDC), a person with temperature at or above 100.4°F (38°C) is considered to have a fever.

Can I go to work with a 99 fever?

All employees should stay home if they are sick until for at least 24 hours, both are true: their symptoms are getting better overall and they have not had a fever* (temperature of 100 degrees Fahrenheit or 37.8 degrees Celsius or higher) and are not using fever-reducing medication (e.g., medicines that contain ...

Is 96.5 a normal temperature?

A temperature of 96 degrees is considered low. (For most adults, around 97 to 99 degrees is normal.) Since a low body temperature can be a sign of a medical condition, it's best to see your healthcare provider. If you also have signs and symptoms of hypothermia, call 911 or go to the nearest ER.

Why is my temperature low when I'm sick?

A: A low body temperature when sick could mean that you have hypothermia. It could also point to sepsis, which is an improper response of the body to an infection, causing the organs to work poorly and get damaged. Both require immediate treatment.

Low Grade Fever Causes

Is 96.5 a normal BBT?

What should my basal temperature be? For most people, 96 to 98 F (35.5 to 36.6 C) is their typical temperature before ovulation. After you ovulate, it goes up to 97 to 99 F (36.1 to 37.2 C).

What is the cutoff for low-grade fever?

Most healthcare providers consider a fever to be 100.4°F (38°C) or higher. A person with a temperature of 99.6°F to 100.3°F has a low-grade fever.

What infection causes a low body temperature?

The early symptoms of sepsis include: a high temperature (fever) or, due to changes in circulation, a low body temperature instead.

What is a low-grade fever with the flu?

The fever accompanying flu is often low-grade, and typically remains under 103 degrees. Other flu symptoms include sore throat, chills, runny or stuffy nose, muscle fatigue and headaches. The flu can also develop into more serious conditions and complications, making it more dangerous than the average cold.

Are you contagious with a 99 fever?

Everything from the common cold to the flu as well as COVID-19 are contagious and can be spread from one person to another. Symptoms that should cause you to stay home instead of visiting with family and friends, or working, include: Fevers higher than 100.4 degrees. Recurring vomiting or diarrhea.

What are the stages of flu?

What to expect with the flu
  • Days 1–3: Sudden appearance of fever, headache, muscle pain and weakness, dry cough, sore throat and sometimes a stuffy nose.
  • Day 4: Fever and muscle aches decrease. Hoarse, dry or sore throat, cough and possible mild chest discomfort become more noticeable. ...
  • Day 8: Symptoms decrease.

Why is my temperature 99 but I feel fine?

A low-grade fever is between 99 degrees F (37.2 C) and 100.4 degrees F (38.0 C). It is usually nothing to worry about and will typically run its course in several days or less without treatment. Infections are the most common cause, but there are also non-infectious causes (including medications and stress).

Should I stay home with a low-grade fever?

A fever is one clear sign of sickness. If your fever is 100.5 degrees or higher, stay home. Other signs that you're too sick to go to work include: Coughing.

Can you go to school with a 99 degree fever?

Kids should stay home when they have symptoms like a fever over 100.4°F, diarrhea, vomiting, or trouble breathing. When in doubt, check with the school. Many have guidelines about what families should do if their kids get sick.

Can you be sick if your temperature is low?

You might think of hypothermia as something that only happens when you're exposed to extremely cold weather for a long time. But it happens indoors, too. A below-normal body temperature can also be a sign that you're sick. Hypothermia is a special concern for the elderly.

What are three red flags for sepsis?

Symptoms of sepsis may include:
  • Change in mental status.
  • Fast, shallow breathing.
  • Sweating for no clear reason.
  • Feeling lightheaded.
  • Shivering.
  • Symptoms specific to the type of infection, such as painful urination from a urinary tract infection or worsening cough from pneumonia.

What virus causes low fever?

Some of the most common respiratory infections, such as a cold or the flu, may cause a low grade fever that lasts for as long as the body takes to fight off the infection. Other symptoms that may indicate a respiratory infection include: coughing.

What is technically considered a low-grade fever?

There's no standard low-grade fever range. But many healthcare providers consider a body temperature between 99.5 degrees Fahrenheit (37.5 degrees Celsius) and 100.3 degrees Fahrenheit (37.9 degrees Celsius) to be a low-grade fever.

What fever does not respond to Tylenol?

Read the label to be sure to take the right dose. Be careful not to take more than one medicine with acetaminophen, such as some cough and cold medicines. Call your healthcare professional if the fever doesn't respond to the medicine, stays at 103 F (39.4 C) or higher or lasts longer than three days.

Should I go to work with a fever of 100?

The following are signs it's time to take a rest day: Fever: A body temperature over 100.4°F (38°C) shows your body is fighting an infection. Rest, hydrate and let your body recover. “Stay home until you've been fever-free for at least 24 hours without fever-reducing medications,” Kadri said.

What is an alarming low body temperature?

Hypothermia is dangerously low body temperature, below 95°F (35°C).

What is an unsafe low temperature?

Hypothermia, or low body temperature, is a condition that occurs when your body's temperature drops below 95 degrees Fahrenheit (35 degrees Celsius). The average normal body temperature is 98.6 F (37 C). Hypothermia is a medical emergency.

Can viral infections cause low body temperature?

When you have an infection, your body's temperature usually rises as it tries to fight off the bug causing the infection. Interestingly, some people see their body temperature go down (hypothermia) instead of up.

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