Emergency department visits involving cannabis hyperemesis syndrome rose sharply across the United States after October 2025, according to a new CDC surveillance report, and the report's own authors identify the most likely reason: clinicians finally got a diagnosis code for it.
The analysis, published in the Morbidity and Mortality Weekly Report on August 6, examined national syndromic surveillance data from January 2023 through May 2026 and identified 199,565 emergency visits involving the condition among more than 407 million all-cause visits.
