What pharmacists and doctors need to know about cannabinoid hyperemesis syndrome
Long-term cannabis use can trigger a condition called cannabinoid hyperemesis syndrome, marked by severe nausea, vomiting, and compulsive hot water bathing.
Quick Facts
What This Study Found
This review described cannabinoid hyperemesis syndrome (CHS), a condition associated with long-term cannabis use characterized by cycles of severe nausea and vomiting without another identifiable cause. A distinctive feature of CHS is that patients develop compulsive hot water bathing behavior, which temporarily relieves symptoms.
Patients with CHS frequently visit emergency departments for relief but are often subjected to extensive diagnostic workups before receiving a correct diagnosis. The authors concluded that CHS is likely underrecognized and underdiagnosed, particularly in emergency settings.
Key Numbers
No large-scale prevalence data were reported. The review synthesized findings from published case reports and small case series available through 2013.
How They Did This
The authors conducted a literature review using PubMed to identify published reports and case series describing cannabinoid hyperemesis syndrome, its clinical features, and management approaches.
Why This Research Matters
As cannabis use has become more common, clinicians have increasingly recognized CHS as a distinct clinical entity. Awareness of this condition can help prevent unnecessary and invasive diagnostic procedures in patients whose symptoms have a straightforward explanation.
The Bigger Picture
CHS challenges the widespread perception that cannabis use carries minimal gastrointestinal risk. The condition appears to be dose and duration dependent, typically emerging after years of regular use, and it resolves only with sustained abstinence from cannabis.
What This Study Doesn't Tell Us
This was a narrative review based primarily on case reports and small series, not controlled studies. The exact prevalence of CHS remained unknown at the time of publication. The mechanisms behind compulsive hot bathing behavior were not well understood.
Questions This Raises
- ?What is the actual prevalence of CHS among long-term cannabis users?
- ?Are certain patterns of use (frequency, potency, route) more likely to trigger the syndrome?
- ?Why does hot water bathing provide temporary relief?
Trust & Context
- Key Stat:
- CHS is considered underrecognized and underdiagnosed in emergency departments
- Evidence Grade:
- Narrative review of case reports and small series, without systematic methodology or controlled data.
- Study Age:
- Published in 2013. Since then, CHS has become much more widely recognized, with larger case series and proposed diagnostic criteria published.
- Original Title:
- Cannabinoid hyperemesis syndrome.
- Published In:
- Hospital pharmacy, 48(8), 650-5 (2013)
- Authors:
- Sun, Shusen, Zimmermann, Anthony E
- Database ID:
- RTHC-00740
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
What is cannabinoid hyperemesis syndrome?
CHS is a condition seen in long-term cannabis users, characterized by episodes of severe nausea and vomiting along with compulsive hot water bathing. It resolves with sustained cannabis abstinence.
Why do people with CHS take hot baths?
The exact mechanism was not well understood at the time of this review, but patients consistently report that hot water bathing temporarily relieves their nausea and vomiting symptoms.
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Cite This Study
https://rethinkthc.com/research/RTHC-00740APA
Sun, Shusen; Zimmermann, Anthony E. (2013). Cannabinoid hyperemesis syndrome.. Hospital pharmacy, 48(8), 650-5. https://doi.org/10.1310/hpj4808-650
MLA
Sun, Shusen, et al. "Cannabinoid hyperemesis syndrome.." Hospital pharmacy, 2013. https://doi.org/10.1310/hpj4808-650
RethinkTHC
RethinkTHC Research Database. "Cannabinoid hyperemesis syndrome." RTHC-00740. Retrieved from https://rethinkthc.com/research/sun-2013-cannabinoid-hyperemesis-syndrome
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.