Most of what you've seen about CHS is wrong.
A team of doctors graded 97 of the most-watched CHS videos online. Only two percent were any good. Here's what they found, and what actually holds up.
Out of 97 videos · 795,000+ combined views
The more views a video had, the less accurate it tended to be.
Popularity didn't track with truth. It tracked with a good story.
Trained reviewers scored every video. Toxicologists settled the calls.
Reviewers graded each video against a CHS content checklist, with medical toxicologists resolving the hard cases. The worst offenders were personal stories: accurate symptoms paired with made-up causes and advice that doesn't work.
Read the full study, free →Dean L, Padley MA, Pham HT, et al. Assessing the Quality of YouTube Videos About Cannabinoid Hyperemesis Syndrome. Cureus. 2026;18(5):e109113. doi.org/10.7759/cureus.109113
The short version, with the receipts.
What CHS is
Cannabinoid hyperemesis syndrome. Years of heavy, regular cannabis use, then cycles of severe nausea and violent vomiting. It often comes with a strange tell: hot showers bring brief relief.
It builds over time, not from one bad batch
CHS is tied to long-term, frequent use. It isn't a contaminated cart or a single bad night, and treating it that way keeps people stuck.
The fix with the most evidence is stopping
Cutting out cannabis is the change best supported by the research. Most of the other "fixes" passed around online don't hold up.
Hot showers buy minutes, not a cure
They can calm an episode for a little while. They don't treat the cause, and leaning on them tends to delay the thing that actually helps.
It can turn into an emergency
Repeated vomiting can cause dehydration and dangerous shifts in your electrolytes. If you can't keep fluids down, get medical care. This page is information, not a substitute for being seen.
How to judge a CHS video.
- ✓Check who made it. A clinician citing sources beats a confident personal story, every time.
- ✓See where it points you. Good information moves you toward stopping and getting evaluated, not away from it.
- ✓Watch for guessing. If it explains the cause with a theory and no evidence, treat the rest with suspicion.
- ✓Be most careful with the relatable ones. In this study, personal testimonials were the worst offenders. A good story is easy. Getting it right is the hard part.
I'm Dr. Rick. I read the studies so you don't have to.
Rick Pescatore, DO · Emergency physician