What cannabinoid hyperemesis syndrome means
Cannabinoid hyperemesis syndrome is characterized by recurring nausea, vomiting, and abdominal pain in some people with a history of frequent cannabis use. Severe vomiting can require urgent care.
Cannabis findings depend on the product, dose, route of administration, population, and outcome measured. A result about one cannabinoid or formulation should not be generalized to every cannabis product.
How strong is the evidence?
We weigh systematic reviews and well-controlled human studies above observational reports, case series, animal studies, and laboratory experiments. Each can answer useful questions, but they do not support the same degree of certainty.
Diagnostic criteria and population estimates continue to develop. Similar symptoms can have other causes, so individual assessment belongs with a clinician.
What readers should do with this
Use this overview to frame better questions for a qualified clinician or researcher. It is not a diagnosis, treatment recommendation, dosing guide, or substitute for local legal advice.