US sees a big jump in nausea cases among frequent marijuana users in the hospital

NEW YORK (AP) — In the past year, the U.S. has seen a jump in frequent marijuana users going to the hospital with a nausea and vomiting condition, according to a report released Thursday.

“The abruptness and sustained magnitude of the increase” is largely due to the condition getting its own diagnosis code last fall, which is providing a more accurate picture of what was an underrecognized problem, the authors of the U.S. Centers for Disease Control and Prevention report wrote.

Hospital emergency room diagnoses of the condition, cannabis hyperemesis syndrome, rose 16% from last October to May of this year, federal researchers found.

The syndrome — seen in people who frequently use marijuana, especially smokers — is characterized by recurring nausea, uncontrollable vomiting and excruciating abdominal pain.

Past research has suggested that an estimated 2.75 million Americans suffer from it each year, and that hospital emergency room visits have been rising as daily recreational marijuana use has increased.

But experts also have said that the syndrome probably has been underdiagnosed, possibly because doctors may not have understood patients' marijuana use or because they attributed the suffering to a different illness.

Tracking the syndrome depended on combining diagnostic codes for nausea and vomiting, and for cannabis use. But last October, a new code was introduced to streamline the diagnosis.

In the new paper, researchers at the CDC's National Center for Injury Prevention and Control looked at emergency room data from about 7,500 healthcare facilities across the country through May. From January 2023 through the summer of 2025, almost 200,000 syndrome-related visits were made to the emergency departments.

The burden on ERs was relatively flat over most of the study period. But then it jumped in October, when the new code went into effect.

The largest increases were seen in people aged 15 to 24, in teenage girls and women, and in Black Americans and in American Indian and Alaska Natives.

The increase in younger people diagnosed with the syndrome “was actually one of the surprising findings for us,” said CDC's Alana Vivolo-Kantor, the study's first author.

“Because the assumption going in was, ‘well, how can they have chronic use?’” she said. “How early were they using cannabis?”

The findings suggest a need to raise awareness about the syndrome, particularly in teens and young adults. The report also suggests a need for more research, including into how newer high-potency THC and hemp-derived products — some of which come in the form of vapes, drinks and gummies — are being used by, and affecting, younger Americans, she said.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

FILE - Marijuana clones are shown for sale in Santa Ana, Calif., April 23, 2026. (AP Photo/Jae C. Hong, File)

A man charged with starting a wildfire in Spokane, Washington, confessed to the crime, describing how he planned it for weeks and created a device to ignite a blaze that destroyed hundreds of buildings, police said.

Aaron Farinacci researched the weather to predict a day that would have “high winds, low humidity, sort of high heat” for the Old Trails Fire, Spokane County Detective Michael Drapeau said in a court filing Wednesday.

Farinacci also looked up the work of a well-known serial arsonist and purchased items to make a “time delay device” for igniting a wildfire, using notebook paper, matches, a cigarette and a rubber band, the detective said.

Drapeau said Farinacci told him that “fire is powerful, beautiful, and that things that go through fire experience a kind of rebirth.”

Farinacci is charged with starting one of three fires in the Spokane area that have burned more than 850 homes and forced the evacuation of tens of thousands of people. He's due in court Thursday for arraignment on a first-degree arson charge. His attorney, Colin Charbonneau, did not not immediately return messages seeking comment.

Farinacci picked Saturday, Aug. 1, to start the fire because he knew there would be strong winds — reaching 50 mph (80 kph), the detective said.

He said he knew it "'was gonna get bad,’” the detective said, but Farinacci claimed he didn’t intend it to grow as much as it did.

Paul Child, 64, has been credited with leading police to Farinacci. He was driving with his grandson along some railroad tracks when he saw a man standing there and looking toward nearby trees. About 10 minutes later, the man was still there.

“He was bent over in the brush, acting nervous,” Child told The Associated Press on Tuesday. “You get the feeling this guy’s up to something.”

“No longer than 10 minutes after I got home, my daughter says, ‘There’s a fire,’” Child recalled. “My first words were, ‘That SOB started a fire!’ It was the exact spot where he was standing.”

Scorched trees stand over the remains of Riverside Real Life church Tuesday, Aug. 4, 2026, after a wildfire hit the northern part of Spokane, Wash. (AP Photo/Lindsey Wasson)

A burned truck sits in a driveway near several destroyed homes in a residential neighborhood Tuesday, Aug. 4, 2026, after a wildfire hit the northern part of Spokane, Wash. (AP Photo/Lindsey Wasson)

Crews work near several burned down houses after a wildfire hit the northwest part of Spokane, Wash., Tuesday, Aug. 4, 2026. (AP Photo/Lindsey Wasson)

A burned section of trees is marked with pink tape Tuesday, Aug. 4, 2026, in an area near the origin point of the Old Trails Fire, after a man was arrested, suspected of starting the wildfire in Spokane, Wash. (AP Photo/Lindsey Wasson)