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:

1. Symptom-free interval phase - The time between symptoms when a child feels completely healthy.  
2. Prodromal phase - During this phase, most children experience nausea.
3. Vomiting phase - During this phase, the child experiences rapid vomiting, combined with nausea and lethargy (tiredness).
4. Recovery phase - This phase begins when the nausea and vomiting stops and extends until the child feels completely healthy again.

Cyclic vomiting syndrome (CVS), in 1882, was first described by English physician Dr. Sanuel Gee. It was first thought to be a pediatric disorder but reciently has been seen in adults over the last several years.

What are the signs and symptoms of pediatric cyclic vomiting syndrome (CVS)?

There is no known cause of CVS.

The most common triggers of episodes include:

• Abdominal pain
• Extreme nausea and/or vomiting
• Diarrhea
• Headache
• Lethargy (tiredness)
• Pale skin

Is there a cure for cyclic vomiting syndrome?

There is no cure for CVS.