Cannabinoid Hyperemesis Syndrome (CHS): When to Worry, and Where to Go

The red flags that mean call 911, when the ER, urgent care, or your doctor is the right choice, likely causes, and what it costs. Or answer a few questions for a recommendation tailored to you.

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Educational guidance, not a diagnosis. Medically reviewed by Dr. Prathima Madda, MBBS. Updated July 15, 2026.

Call 911 now if you have:

Vomiting blood, or vomit that looks like dark brown coffee grounds (a tear or bleeding in the esophagus or stomach from forceful retching)
Chest pain, a racing or irregular heartbeat, fainting, or severe muscle weakness (heavy vomiting can drop your potassium and trigger dangerous heart rhythms)
Confusion, a seizure, or being difficult to wake
Signs of severe dehydration: no urine for many hours, no tears or a very dry mouth, dizziness or passing out when you stand, and a rapid heartbeat
Severe, constant abdominal pain that is different or worse than your usual episodes (do not assume every belly pain is CHS)

When in doubt about a possible emergency, call 911. Do not drive yourself.

CHS causes repeated cycles of severe nausea, vomiting, and belly pain in people who use cannabis regularly, often for years. Many people find that hot showers or baths are the only thing that helps during an episode.
The one treatment that reliably works is stopping all cannabis, including edibles, vapes, and concentrates. Symptoms usually ease within a few days to two weeks of quitting, and tend to return if cannabis use resumes.
CHS is often mistaken for a stomach bug or cyclic vomiting, so people frequently make several ER visits and get repeated scans and lab work before it is recognized, which is what drives the bills up.
The real danger is not the vomiting itself but its complications: dehydration, low potassium that can affect the heart, kidney injury, and tears in the esophagus from retching.

ER, Urgent Care, Doctor, or Home?

Go to the ER

Go to the ER for a first severe episode so other serious causes can be ruled out, or any time the vomiting will not stop and you cannot keep any fluids down. Even a familiar CHS flare needs care once dehydration sets in.

Relentless vomiting where you cannot keep down even small sips of water for several hours
Signs of significant dehydration: little or no urine, extreme weakness, dizziness on standing, or a racing heart
Your first severe episode, or symptoms that differ from your usual pattern, so a doctor can rule out appendicitis, pancreatitis, a bowel blockage, or a pregnancy-related cause
Severe abdominal pain, a swollen belly, or a high fever along with the vomiting
Any vomiting of blood or coffee-ground material

Urgent care

Moderate nausea and vomiting when you can still keep down small sips, and you want IV fluids and anti-nausea medicine without an ER wait
A known CHS pattern flaring up but not yet causing severe dehydration
Keep in mind that urgent care can give fluids and medicine and refer you, but cannot do the full workup an ER can if something looks atypical

See your doctor / telehealth

Recurring episodes you suspect are CHS, to confirm the diagnosis and get a plan (a primary care doctor or a gastroenterologist)
Help quitting cannabis, which is the actual cure; ask about support for cannabis use disorder
A prescription for topical capsaicin cream or other medicines that can ease flares
A follow-up visit after an ER trip, which is one of the best ways to avoid repeat emergency visits

Safe to manage at home

If you already have a confirmed CHS diagnosis and a mild flare, hot showers or baths often relieve symptoms temporarily
Take small, frequent sips of clear fluids or an oral rehydration solution to stay ahead of dehydration
Over-the-counter capsaicin cream on the belly helps some people; ask your doctor before trying it
The lasting fix is stopping cannabis completely, since symptoms come back if you resume
Do not rely on home care during a first severe episode or if you cannot keep any fluids down

Not sure which fits your situation? Answer a few questions for a recommendation, or see the full ER vs. urgent care guide.

Common Causes

These are possibilities to discuss with a clinician, not a diagnosis. Only an exam and sometimes tests can tell which applies to you.

Cannabinoid hyperemesis syndrome itself, from long-term, regular cannabis use
Cyclic vomiting syndrome (a similar pattern that is not caused by cannabis)
Gastroenteritis, a common stomach bug
Appendicitis, gallbladder disease, or pancreatitis
A bowel obstruction
Pregnancy-related vomiting, including severe morning sickness (hyperemesis gravidarum)
Stomach ulcers or gastritis
Diabetic ketoacidosis or another metabolic problem

What to Expect if You Are Seen

The team will ask about your cannabis use, including how much, what forms, and for how long. Being honest speeds the diagnosis and avoids unnecessary tests.
Expect blood tests to check hydration, potassium and other electrolytes, and kidney function.
You will likely get IV fluids and anti-nausea medicine. Standard anti-nausea drugs often work poorly in CHS, so doctors may use topical capsaicin cream or medicines such as haloperidol or a benzodiazepine.
For a first or unusual episode, expect imaging such as an ultrasound or CT scan, and a pregnancy test where relevant, to rule out other causes.
Because CHS is easy to miss, some people go through several ER visits, scans, and even endoscopies before it is diagnosed, which is why the bills add up. Telling the team you suspect CHS can shorten that path.
The care team should connect you with support to stop cannabis, which is the only lasting fix.

Worried about the cost?

See typical pricing in our ER visit cost guide and ER visit cost guide, or estimate your exact cost. Uninsured? Check hospital charity care. Already have a bill? Bill Defense can negotiate it down.

Before You Go, Have This Ready

How much cannabis you use and in what forms (flower, edibles, vapes, concentrates), and how long you have used it
How many similar episodes you have had, and whether hot showers help, which is a strong clue for CHS
A list of your medicines and supplements
Your insurance card, or if you are uninsured, a note to ask about financial assistance before tests are ordered
Notes or records from any prior ER visits or scans, so the same tests are not needlessly repeated

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Frequently Asked Questions

Is cannabinoid hyperemesis syndrome an emergency?

The vomiting itself is not always an emergency, but its complications can be. Get emergency care if you cannot keep any fluids down, show signs of severe dehydration, have chest pain or palpitations, or vomit blood. A first or unusual episode should be checked to rule out other serious causes.

What is the fastest way to stop a CHS episode?

In the moment, many people get relief from hot showers or baths, and doctors may use topical capsaicin cream or specific medicines. But the only treatment that stops CHS from coming back is quitting cannabis entirely. Anti-nausea drugs that work for other causes often do not help much here.

How long does CHS last after you quit cannabis?

Most people improve within a few days to two weeks of stopping all cannabis, though some take longer. Symptoms usually return if cannabis use resumes, even months later.

Why do I keep getting big ER bills for this?

CHS is frequently mistaken for a stomach bug or cyclic vomiting, so patients often make repeated ER visits and get scans, lab work, and sometimes endoscopies before it is recognized. Naming CHS as a possibility, sharing prior test results, and following up with a doctor can reduce repeat visits. If you have already been billed, CareRoute Bill Defense can review and negotiate the charges.

Can hot showers really help?

Yes. Compulsive hot bathing is one of the most recognizable signs of CHS, and many patients find it is the only thing that relieves symptoms during an episode. It is a temporary comfort measure, not a cure, and very hot water can cause burns, so be careful.

Does insurance cover CHS treatment?

Yes. CHS is treated as a standard medical condition, so ER visits, IV fluids, tests, and follow-up care are covered like any other emergency or doctor visit. That is different from dispensary cannabis itself, which no health insurance covers.

More symptom guides

All symptom guides Free symptom checker ER vs. urgent care

Sources

Cleveland Clinic (Cannabinoid Hyperemesis Syndrome overview)
Annals of Emergency Medicine / American College of Emergency Physicians (CHS in the emergency department)
NIH StatPearls (Cannabinoid Hyperemesis Syndrome)
JAMA Network Open (cannabis-related emergency department visits)

This guide is educational and not a substitute for professional medical advice. For an emergency, call 911. Medically reviewed by Dr. Prathima Madda, MBBS. Last updated July 15, 2026.