Cannabis Hyperemesis Syndrome in Youth: Three Phases of a Frequently Misdiagnosed Condition | Research

The takeaway

A review of Cannabis Hyperemesis Syndrome in young people describes three distinct phases (prodromal, hyperemetic, recovery), emphasizes frequent misdiagnosis, and calls for targeted education in schools and healthcare settings.

Emergency physicians, pediatricians, school health staff, and adolescents who use cannabis regularly.

What the researchers found

CHS progresses through three phases: a prodromal phase with early morning nausea often mistakenly relieved by continued cannabis use; a hyperemetic phase with severe vomiting, dehydration, and electrolyte imbalances (temporarily relieved by hot showers); and a recovery phase where symptoms resolve and normal habits return.

Why it matters

As adolescent cannabis use increases, CHS is being diagnosed more frequently but remains widely misunderstood. The prodromal phase is particularly dangerous because continued cannabis use to alleviate nausea actually perpetuates the condition, leading to delayed diagnosis and unnecessary medical workups.

The numbers in context

No quantitative data pooled; this is a narrative review. Three distinct phases described. Potential complications include electrolyte imbalances and dehydration requiring critical care.

How the study worked

Narrative review of literature on CHS in youth populations, covering pathophysiology, clinical progression, diagnostic challenges, treatment strategies, and public health implications.

What this study cannot tell us

Narrative review without systematic methodology. CHS diagnostic criteria are not fully standardized. Prevalence data in youth specifically are limited. The review does not quantify how common CHS is among adolescent cannabis users.

How to read the evidence

Comprehensive clinical review of a recognized condition, but narrative format and limited youth-specific data reduce evidence strength.

When this study was published

Published 2025.

The bigger picture

CHS represents one of the clearest dose-response harms of regular cannabis use: it occurs almost exclusively in chronic, heavy users and resolves completely with cessation. Its increasing recognition in youth populations underscores that cannabis, while generally lower-risk than many substances, is not risk-free for regular users.

Questions still open

What proportion of adolescent heavy cannabis users develop CHS
Whether certain cannabis products or consumption patterns pose higher CHS risk than others

Common questions

Why do hot showers help with CHS?

The exact mechanism is debated, but it may involve activation of heat-sensitive receptors (TRPV1) that interact with the endocannabinoid system. Hot showers or baths provide temporary relief during the hyperemetic phase, which is actually a diagnostic clue for CHS.

How is CHS different from regular nausea?

CHS follows a specific cyclical pattern tied to chronic cannabis use. It typically involves severe, recurrent vomiting episodes with temporary hot-water relief, resolves completely when cannabis is stopped, and returns when use resumes. Many patients undergo extensive (and unnecessary) GI workups before CHS is considered.

Read the original research

Cannabis Hyperemesis Syndrome in Youth: Clinical Insights and Public Health Implications.

International journal of environmental research and public health, 22(4)

View on PubMed ↗Publisher’s paper ↗

Citation

Seabrook, Jamie A; Seabrook, Morgan; Gilliland, Jason A. (2025). Cannabis Hyperemesis Syndrome in Youth: Clinical Insights and Public Health Implications.. International journal of environmental research and public health, 22(4). https://doi.org/10.3390/ijerph22040633