While most children who get COVID-19 have a mild or even asymptomatic illness, there are new reports that some children may have a complication that can be severe and dangerous.

Called pediatric multisystem inflammatory syndrome (PMIS), it can lead to life-threatening problems with the heart and other organs in the body. Early reports compared it to Kawasaki disease, an inflammatory illness that can lead to heart problems. But while some cases look very much like Kawasaki’s, others have been different. Experts think that PMIS is likely a reaction of the body to either a current or past COVID-19 infection — but there is much we don’t understand, including why some children with PMIS have negative tests for COVID-19.

What are the symptoms of the new inflammatory syndrome known as PMIS?

Symptoms of PMIS vary from case to case, but can include

  • prolonged fever (more than a couple of days)
  • rash
  • conjunctivitis (redness of the white part of the eye)
  • stomachache
  • vomiting and/or diarrhea
  • a large, swollen lymph node in the neck
  • red, cracked lips
  • a tongue that is redder than usual and looks like a strawberry
  • swollen hands and/or feet
  • irritability and/or unusual sleepiness or weakness.

There are many other conditions that can cause these symptoms. For example, strep throat can cause fever, rash, swollen lymph nodes, and a “strawberry tongue,” and there are plenty of common viruses that cause stomachache, vomiting, and diarrhea. Doctors make the diagnosis of PMIS based not just on these symptoms, but also on their physical examination as well as medical tests that check for inflammation and how organs are functioning.

What parents need to know about PMIS

We are just learning about PMIS. At this point we have many more questions than answers. But here is what parents need to know about this syndrome:

  • It is rare. While there is a lot about it in the news, the number of cases is actually low, especially when you consider how widespread

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