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Pediatric Cyclic Vomiting Syndrome (CVS)


What is Pediatric Cyclic Vomiting Syndrome (CVS)?

Cyclic vomiting syndrome (CVS) is a disorder in which a child has continuous cycle of symptoms that involve periods of extreme nausea, followed by rapid vomiting. They then experience a period of recovery, followed by a period of normal health with no symptoms. The cycle then begins again, and happens over and over.

Some medical researchers believe that CVS is a type of abdominal migraine. CVS most often happens in young children; however, it can occur at any age.

What are the stages of cyclic vomiting syndrome?

The stages of CVS are categorized as:

  • Symptom-free interval phase — The time between symptoms when a child feels completely healthy.  

  • Prodromal phase — During this phase, most children experience nausea.

  • Vomiting phase — During this phase, the child experiences rapid vomiting, combined with nausea and lethargy (tiredness).

  • Recovery phase — This phase begins when the nausea and vomiting stops and extends until the child feels completely healthy again.



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