A rare vomiting condition associated with chronic cannabis use is becoming more common at emergency departments in the US.

The condition, called cannabinoid hyperemesis syndrome (CHS), is marked by severe and cyclical bouts of uncontrollable nausea, abdominal pain, and vomiting.

The first case in the US was only reported in 2009, and until recently, CHS did not even have a national diagnostic code, making it a challenge to track.

Visits to the emergency room are one of the only ways to identify who is affected and why.

Between 2016 and 2022, researchers at the University of Illinois Chicago found that CHS visits to emergency departments rose from roughly 4 visits per 100,000 people visiting the emergency department to 22 visits per 100,000.

Related: Cannabis Use Is Linked to Epig

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