Cyclic vomiting syndrome (CVS) is defined as discrete, sudden attacks of vomiting lasting from several days to a week and occurring three or more times per year. The vomiting may even occur on an empty stomach. There may or may not be pain associated with the vomiting. Between episodes, the individual does not experience nausea or vomiting. The diagnosis is supported by the stereotypical description of episode and symptom free periods, a personal or family history of migraine headaches, or of abdominal migraine which is seen more commonly in children. In addition, CVS can be associated with the use of frequent hot showers or baths to control the symptoms or the use of marijuana. Recently it has been found that marijuana can cause symptoms of CVS and if it does the disorder is called cannabinoid hyperemesis syndrome. Though the exact mechanism of CVS is not known, many associations have been noted like seizures, and symptoms are often similar to panic attacks.
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