When to Visit the ER for a Fever

Mild fever is generally easy to treat at home with rest, fluids and over-the-counter medicine. However, sometimes fever is an indicator of a more serious infection. See below to help determine whether you need to seek emergency care for yourself or your child.

Babies Under 90 Days

If your child is under 90 days old, seek emergency care if he or she has a temperature over 100.4 degrees, or if your child’s fever is accompanied by the following symptoms:

  • Vomiting
  • Rash
  • Difficulty breathing
  • Non-stop crying or inconsolable
  • Difficulty waking up to feed

Babies 90 Days to 36 Months

If your child is between 90 days and 36 months, seek emergency care if he or she has a temperature over 102.2 degrees, or if he/she is also has the following symptoms:

  • Inconsolable
  • Not immunized
  • Unable to keep fluids down
  • Not urinating
  • Difficulty breathing
  • Rash
  • Difficulty waking up

Children 36 Months and Older

If your child is 36 months or older, seek emergency care if he or she has temperature over 102 degrees for two or more days, or if the fever is accompanied by any of the following symptoms:

  • Does not look well
  • Cannot keep fluids down
  • Burning during urination or does not urinate
  • Rash
  • Difficulty breathing or swallowing
  • Stiff neck
  • Abdominal pain


Seek emergency care if you or a loved one has a fever that lasts for more than two days, or if the fever is accompanied by any of these symptoms: 

  • Difficulty breathing
  • Headache
  • Abdominal pain 

If you have one of these medical conditions and a fever, you should seek emergency care: 

  • Compromised immune system
  • Recent chemotherapy 

HealthONE has 12 full-service emergency departments in the Denver metro area, so you’re certain to find an ER that is close to home and able to help you. Our hospitals strive to beat the national average wait time, so you can get quick access to high-quality emergency medical care.

ERs in Metro Denver

View HealthONE Emergency Rooms in a larger map

Emergency Room Care / Denver ERs

The Medical Center of Aurora
Saddle Rock ER 
Centennial Medical Plaza
North Suburban Medical Center
North Suburban Northeast ER
North Suburban Northwest ER
Presbyterian / St. Luke's Medical Center
Rocky Mountain Hospital for Children at P/SL
Rose Medical Center
Sky Ridge Medical Center
Swedish Medical Center
Swedish Southwest ER