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When Your Child Has Cyclic Vomiting Syndrome (CVS)  

Boy holding stomach, looking distressed.
With CVS, your child may have symptoms that include abdominal pain and nausea.


What causes CVS?

No one knows for sure what causes CVS. It’s likely related to migraine headaches, with similar triggers . Sometimes, if a family member suffers migraines, children might be more likely to have CVS. It can affect children of any age. It often first shows up in children from ages 3 to 7. Children with CVS may also have other GI (gastrointestinal) issues or health problems.

What can trigger a CVS episode?



  • Viral infections (such as colds)

  • Allergies or sinus problems

  • Foods (such as chocolate or cheese)

  • Motion sickness

  • Menstrual period

  • Lack of sleep

  • Exhaustion

The 4 phases of CVS

CVS happens in 4 phases or stages:

  • Prodrome phase. This phase signals that an episode is about to start. Symptoms include: aura (odd sensations), sensitivity to light, stomach pain, headache, or nausea. The prodrome phase can come on in minutes, or it can come on over a few hours. An episode can sometimes be stopped during this phase with medicine.


  • Recovery phase. This phase starts when vomiting or retching stops. Your child is likely exhausted. She or he may fall asleep right away. It's common for children to wake up with muscle pain from the vomiting.


How is CVS diagnosed?

To diagnose CVS, the healthcare provider must first rule out other problems. The healthcare provider will ask about your child’s health history. This can help show the cycle of symptoms that point toward CVS. Tests may also be done, including blood tests to rule out other causes of vomiting. Radiology tests, such as an upper GI series, may also be done. This test can show the healthcare provider if there is a problem with your child's digestive system 

How is CVS treated?

There is no cure for CVS. But you and your child can learn ways to try to prevent episodes. You can also learn how to stop an episode as it starts (see Preventing Future Episodes). Once severe vomiting starts, though, your child will likely need to go to the hospital right away. At the hospital, your child will get medicines to try to stop the vomiting. Your child will likely need fluids to stay hydrated. This is usually done using an intravenous (IV) line. If needed, nutrition can also be given to your child through the IV line. Your child will likely stay in the hospital until the episode stops. There, your child can also get care during the recovery phase.

Preventing future episodes

CVS episodes can be stressful and scary for you and for your child. It might help to know that you can act to prevent or manage episodes. Start by learning your child’s triggers. If your child is exposed to a trigger, or has prodrome symptoms, take action as directed by the healthcare provider. This can help stop the episode before it even starts. Sometimes, an episode can’t be prevented or stopped at home. When this happens, your child will need to be admitted to the hospital or emergency room. There, your child will get needed treatment, fluids, and observation. If your child has episodes often, longer term medicines may be effective at decreasing the frequency and severity of attacks. 

Long-term concerns

The good news is that children can outgrow CVS. This often happens in their teens. However, they may be more likely to have migraine headaches as adults. Your child may also be at higher risk for anxiety. For now, you should pay careful attention to your child’s teeth. Repeated vomiting can destroy tooth enamel due to the strong acids in your child’s stomach. This can lead to tooth decay. To help prevent tooth decay:


