A doctor will often suspect cyclic vomiting syndrome in a child when all of the following are present:

  • At least five episodes over any time period, or a minimum of three episodes over a 6-month period
  • Episodes lasting 1 hour to 10 days and happening at least 1 week apart
  • Episodes similar to previous ones, tending to start at the same time of day, lasting the same length of time, and happening with the same symptoms and intensity
  • Vomiting during episodes happening at least four times an hour for at least 1 hour
  • Episodes are separated by weeks to months, usually with no symptoms between episodes
  • After appropriate medical evaluation, symptoms cannot be attributed to another medical condition

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