Table 1.

Criteria for cyclic vomiting syndrome and cannabinoid hyperemesis syndrome.

Cyclic Vomiting Syndrome (CVS)	Cannabinoid Hyperemesis Syndrome (CHS)
Stereotypical episodes of vomiting acute in onset At least three discrete episodes in the prior year and two episodes in the past six months, occurring at least one week apart Absence of vomiting between episodes, but other milder symptoms can be present between cycles Criteria fulfilled for the last three months with symptom onset at least six months prior to diagnosis	Symptoms present for past three months with onset at least 6 months prior Stereotypical episodes lasting <one week At least 3 episodes in last one year and 2 episodes in last six months (occurring at least one week apart) No vomiting between episodes Milder symptoms can be present during this All these criteria should be associated with chronic use of cannabis and stop after its cessation