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Doctors warn cannabis users about horrible side effect that could land them in hospital
Home>Science>News
Published 15:19 4 Dec 2025 GMT

Doctors warn cannabis users about horrible side effect that could land them in hospital

Regular users of cannabis are being urged to be cautious over a particular side effect

Rikki Loftus

Rikki Loftus

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Featured Image Credit: THOMAS SAMSON/AFP via Getty Images
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Doctors are warning the public about a horrible side effect that could impact cannabis users, potentially landing them in hospital.

Regular users of cannabis are being urged to be cautious over a particular side effect that could cause health issues.

This comes after a survey in 2023 revealed that 17% of Americans admitted that they had smoked a joint, with the drug now being legal in 24 states across the US.

Since then, experts have been analyzing the way that chronic cannabis users are affected by the drug.

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While we all know that munchies are a typical and common side effect, more serious problems such as stomach-churning attacks are on the rise, according to scientists.

This comes after it was reported that emergency departments in hospitals across the country have been treating patients experiencing abdominal pain and severe or prolonged vomiting, with their common trait being they are chronic cannabis users.

Regular users of cannabis are being urged to be cautious over a particular side effect that could land them in hospital (Lindsey Nicholson/UCG/Universal Images Group via Getty Images)
Regular users of cannabis are being urged to be cautious over a particular side effect that could land them in hospital (Lindsey Nicholson/UCG/Universal Images Group via Getty Images)

The condition is known as cannabis hyperemesis syndrome (CHS), a disorder that triggers unpleasant symptoms such as nausea. UW Medicine explains how the gut condition usually occurs within 24 hours of the most recent use and can last for days.

Furthermore, chronic cannabis users can experience the symptoms three to four times per year.

The World Health Organization’s International Classification of Diseases has since listed the condition on their website, which should allow experts to carefully monitor cases and see how regular cannabis use can impact the human body.

Beatriz Carlini, a research associate professor at the University of Washington School of Medicine, said: “It helps us count and monitor these cases. In studying addiction and other public health concerns, we have three sources of data: what clinicians tell us, what people in the communities tell us, and what health records tell us.

“A new code for cannabis hyperemesis syndrome will supply important hard evidence on cannabis-adverse events, which physicians tell us is a growing problem.”

Doctors are warning the public about a horrible side effect that could impact cannabis users (THOMAS SAMSON/AFP via Getty Images)
Doctors are warning the public about a horrible side effect that could impact cannabis users (THOMAS SAMSON/AFP via Getty Images)

While the condition may now be recognised by the WHO, many doctors are unfamiliar with the syndrome, meaning an incorrect diagnosis, such as food poisoning or the stomach flu, is possible.

Carlini continued: “A person often will have multiple [emergency department] visits until it is correctly recognized, costing thousands of dollars each time.”

Research into the syndrome will continue, as scientists work out at what point cannabis users become vulnerable to the condition.

Emergency medicine specialist, Dr Chris Buresh, said: “Some people say they’ve used cannabis without a problem for decades. Or they smoke pot because they think it treats their nausea.

“It seems like there’s a threshold when people can become vulnerable to this condition, and that threshold is different for everyone. Even using it in small amounts can make these people start throwing up.”

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