Heart and Blood Conditions

Myocarditis Symptoms and Diagnosis

  • Schedule an appointment +

    • For appointments in Seattle, Bellevue, Everett, Federal Way, Olympia, Tri-Cities and Wenatchee, call 206-987-2515.
    • For appointments in Tacoma and Silverdale, call 253-272-1812.
    • For appointments in Alaska, call 907-339-1945.

    If this is a medical emergency, call 911.

  • Find a doctor +

  • Locations +

    • Seattle Children's Main Campus: 206-987-2515
    • Bellevue Clinic and Surgery Center: 425-454-4644
    • Everett: 425-304-6080
    • South Clinic in Federal Way: 253-838-5878
    • Olympia: 360-459-5009
    • South Sound Cardiology Clinics: 253-272-1812
    • Tri-Cities (Richland): 509-946-0976
    • Wenatchee: 509-662-9266
    • Pediatric Cardiology of Alaska: 907-339-1945
    • Seattle Children's doctors provide many cardiac services at regional sites throughout the Pacific Northwest. See our complete list of Heart Center locations.

  • Refer a patient +

    • If you are a provider, fax a New Appointment Request Form (NARF) (PDF) (DOC) to 206-985-3121 or 866-985-3121 (toll-free).
    • No pre-referral work-up is required for most conditions. If you have already done testing such as an EKG, Holter monitor or echocardiogram, please fax this information as well as relevant clinic notes and the NARF to 206-985-3121 or 866-985-3121 (toll-free).
    • Your patient will be seen as quickly as possible by the provider who is the best match for managing the current problem.
    • View our complete Heart Center Referral Information (PDF).

Symptoms of Myocarditis

A baby with myocarditis may have these symptoms:

  • Fever
  • Fast heartbeat or arrhythmia  
  • Fast breathing
  • Trouble feeding or working hard to breathe when feeding
  • Failure to thrive  
  • Being restless or irritable
  • Sweating more than normal
  • Having little energy or not taking interest in anything
  • Not putting out as much urine as normal
  • Having pale or bluish hands and feet (cyanosis)
  • Vomiting

Older children may also have a cough, nausea, abdominal or chest pain, and swelling in their legs, feet and face. They may be more tired than normal.

Myocarditis Diagnosis

To diagnose this condition, your doctor will examine your child, use a stethoscope to listen to their heart and look for signs of infection or heart failure.

The doctor will ask for details about any symptoms your child has, their health history and your family health history.

Your child will need tests that provide more information about how their heart looks and works. These may include a chest X-ray, echocardiography, electrocardiogram, magnetic resonance imaging (MRI), and cardiac catheterization. They will also need polymerase chain reaction (PCR) testing, a blood test to check for infections.

Contact Us

Contact the Heart Center at 206-987-2015 for a cardiac referral, a second opinion or more information.