Cannabinoid hyperemesis syndrome, or CHS, is a condition associated with long-term heavy cannabis use that causes recurring episodes of severe nausea, vomiting, and abdominal pain. People with CHS often report temporary relief from hot showers or baths, but the condition generally resolves only when cannabis use stops.
What causes CHS?
The exact mechanism is not fully understood. CHS appears to involve chronic exposure to cannabinoids and changes in the endocannabinoid system, gastrointestinal function, and temperature regulation. Research is still evolving.
What are the main symptoms?
Typical symptoms include repeated vomiting, persistent nausea, abdominal pain, dehydration, and difficulty keeping fluids down. Episodes may alternate with periods of fewer or no symptoms.
Why do hot showers sometimes help?
Many people with CHS report that hot showers or baths temporarily reduce nausea and abdominal discomfort. This pattern can be a diagnostic clue, but it is not specific enough to diagnose CHS by itself.
How is CHS different from cyclic vomiting syndrome?
Both conditions can cause repeated vomiting episodes. The key distinction is the relationship to chronic cannabis use and sustained improvement after cannabis cessation. Clinicians may need time and follow-up to distinguish the two.
Can CHS become dangerous?
Yes. Repeated vomiting can cause dehydration, electrolyte abnormalities, kidney problems, fainting, or other complications. Severe symptoms may require emergency care.
Does stopping cannabis cure CHS?
Sustained cannabis cessation is the most important long-term treatment. Acute medical care can help manage dehydration and severe vomiting, but ongoing cannabis use can lead to recurrence.
Can CHS happen with medical cannabis?
Yes. CHS is associated with chronic cannabinoid exposure rather than whether the cannabis was obtained medically or recreationally.
When should someone seek care?
Emergency evaluation is appropriate for severe or persistent vomiting, inability to keep fluids down, fainting, confusion, blood in vomit, severe abdominal pain, or signs of dehydration.
Trinity Behavioral Health provides adult drug and alcohol treatment information for people concerned about cannabis use. This article does not replace emergency or gastrointestinal medical care.
Frequently asked questions
Can CHS happen after only occasional cannabis use?
CHS is most strongly associated with long-term, frequent cannabis exposure rather than occasional use.
Do anti-nausea medications always work?
No. CHS can be resistant to standard antiemetics, which is one reason the diagnosis may be challenging.
Can CHS come back after cannabis is restarted?
Yes. Recurrence after resuming cannabis use is common in published clinical reports.
Is CHS the same as cannabis withdrawal?
No. CHS causes recurrent vomiting during ongoing heavy cannabis use, while cannabis withdrawal begins after reduction or cessation and has a different symptom pattern.
Sources
- National Institute on Drug Abuse: Cannabis
- 2025 Review: Cannabinoid Hyperemesis Syndrome
- Systematic Review: Treatment of Cannabinoid Hyperemesis Syndrome
This article is general educational information and does not replace individualized medical evaluation.