A mysterious syndrome that makes marijuana users violently ill is starting to worry doctors
- A new study documents a sharp rise in emergency room visits linked with marijuana following legalization in Colorado.
- One of the key drivers of the ER visits is a mysterious syndrome characterized by severe nausea and repeated vomiting.
- Called cannabinoid hyperemesis syndrome, or CHS, very little is known about the condition.
- The only known cure for CHS is to stop using marijuana. Researchers still aren't sure what causes it.
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Now, several recent studies from emergency room physicians across Europe and the US are beginning to suggest that CHS could be a lot more common than previously thought.The latest study was published on Monday by a team of clinicians in Colorado, where marijuana was legalized medically in 2009 and recreationally in 2014. In their study, which appeared in the journal Annals of Internal Medicine, the physicians describe more than 2,500 cannabis-related emergency visits to a large public hospital in the state between 2012 and 2016.
Stomach issues like nausea and vomiting were the main driver of the trips, even before psychiatric problems like intoxication and paranoia.And of those stomach issues, CHS was both the single most commonly-reported problem as well as the top reason for patients to be booked at the hospital. "To see that this was a leading reason for people coming to the ER, that was pretty striking," Andrew Monte, the new paper's lead author and an associate professor of emergency medicine at the University of Colorado School of Medicine, told Business Insider.
"We have to do a better job of educating users on the fact that this phenomenon exists," he added.
Nora Volkow, the director of the National Institute of Drug Abuse, echoed Monte's concerns about cannabis and CHS in an editorial published alongside the new study."We must recognize that the full range of potential adverse health consequences from cannabis consumption are not fully understood," she wrote.
From 'barely known' illness to something that could affect millions each year
Two decades ago, the condition was completely unheard of. Then in the early 2000s, a spate of researchers began to describe clusters of stomach-related issues that appeared to stem from heavy and repeated cannabis use. Although they coined a name for the problem - CHS - they still had no idea what was causing it or how to stop it.More than a decade later in 2017, a team of German ER doctors described CHS as a "barely known" illness characterized by intense nausea, vomiting, and stomach pain. They still hadn't pinned down a cause, but they did identify a cure: quitting cannabis.
Of the weed-related visits, 31% were stomach-related - making stomach issues the leading cause of all ER trips for cannabis. And out of the stomach-related cannabis visits, CHS emerged as the single most common adverse event and the main driver of hospital admissions.Monte's findings are beginning to chip away at the previously-held assumption that CHS is uncommon. "CHS is certainly not very rare," Monte told Business Insider. "We see it absolutely every week in our ER."
Other researchers agree.
"This isn't surprising and we're certainly going to see more of this" Joseph Habboushe, an associate professor at NYU Langone and the lead author of the CHS paper published last year, told Business Insider.Habboushe is currently working on a study that aims to identify some new relief methods for the symptoms of CHS. Monte said one of his graduate students was working on a similar paper.
For Mrs. X, the only thing that helped was quitting. When she tried to start smoking again, she was okay for a few months, but then her symptoms returned.
"Patients [who] re-challenged themselves by resuming marijuana ... relapsed within months," the authors of the Australian study documenting Mrs. X's case report wrote in 2004.
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