Cannabis-linked vomiting disorder rises sharply, especially among young users

A new cannabis-related disorder is on the rise in U.S. emergency rooms, particularly among teenagers and young adults, according to a report from the Centers for Disease Control and Prevention. Between October 2025 and May 2026, diagnoses of cannabis hyperemesis syndrome, or CHS, increased by 16%. This illness, which causes severe nausea, repeated vomiting, and intense abdominal pain, is believed to develop after years of chronic marijuana use.

However, the rise in reports may actually reflect better diagnosis and reporting following the introduction of a specific diagnostic code in medical systems. Most cases were reported among people aged 15 to 24, surprising researchers who usually associate CHS with long-term marijuana use. From January 2023 to summer 2025, over 200,000 emergency room visits related to the syndrome were recorded across nearly 7,500 facilities nationwide.

Rates remained steady prior to the new diagnostic code but spiked afterward. The syndrome is thought to be caused by the chronic overstimulation of the endocannabinoid system, which disrupts the body's natural digestive and brain control mechanisms. Symptoms typically include morning nausea, abdominal pain, and a strong urge to shower in hot water.

Treatment involves stopping marijuana use and managing symptoms with intravenous fluids, anti-nausea medications, and pain relievers.