Nausea and Vomiting

CHS treatment: what helps at home and in the ER

July 19, 2026 · Rick Pescatore, DO

CHS is a disorder of gut-brain interaction (DGBI), the category doctors used to call "functional," and it comes from prolonged, heavy cannabis use. It is not irritable bowel syndrome. It sits in the stomach and first part of the small intestine, which is why the hallmark is relentless vomiting rather than the bowel changes of IBS. If you want the full picture of the mechanism, here is what CHS is and why it happens. This piece is narrower and more practical: what to do when you are in the middle of an episode, or bracing for the next one.

One thing up front, stated plainly because it is the whole game. The only treatment that ends CHS is stopping cannabis. Not cutting back, not switching products, not taking a break during the bad weeks. Everything else on this page eases a single episode. None of it cures the condition, and no supplement, vitamin, or magnesium product treats or prevents CHS either. If someone is selling you one, they are wrong.

What helps a CHS episode at home?

A hot shower or hot bath is the single most reliable at-home measure. In reported CHS series, roughly 92 percent of people get relief from heat. Topical capsaicin cream on the abdomen works by the same mechanism. Rest and small, slow sips of fluid help too. These abort or ease an episode. They do not fix the underlying problem.

The reason heat works is not mysterious. Your skin has a receptor called TRPV1 (transient receptor potential vanilloid 1), the same one that responds to the heat of a chili pepper. Hot water and capsaicin both switch it on, and in CHS that appears to interrupt the nausea and vomiting signal. This is why capsaicin cream, spread on the stomach and lower back where you can tolerate the burn, is a portable version of the shower. It stings. That is the point, and it is not dangerous on intact skin.

Practical tip: Make the water as hot as you can safely stand, not scalding. People with CHS often end up taking very long or very frequent showers during an episode. That behavior is a clue to the diagnosis, not a problem in itself, though watch for burns and do not run a bath so hot it makes you lightheaded when you are already dehydrated.

Tornblom and colleagues, writing in Gastroenterology in 2026, describe these heat-based and TRPV1-targeted measures as the reasonable first-line abortive approach for an episode. If you want the longer version of the mechanism, see why hot showers help. Keep fluids going in whatever amount you can hold down. Even small sips matter, because the real hazard here is not the vomiting itself, it is what the vomiting does to your hydration.

When should I go to the ER for CHS?

Go when you can no longer keep fluids down, or when signs of dehydration show up: little or dark urine, dizziness, a racing heart, confusion. Also go for anything that does not fit a plain CHS episode, such as chest pain, severe or worsening belly pain, or blood in the vomit. Dehydration is the thing that actually puts people in the hospital.

Go to the ER now if you: cannot keep any fluids down, are urinating very little or your urine is dark, feel dizzy, faint, or confused, have chest pain, have severe or worsening belly pain, see blood in your vomit, or are vomiting that will not stop. These are signs of dangerous dehydration or of a problem that is not just CHS. Do not wait it out.

The instinct to tough it out at home is understandable, especially if you have had episodes before and know they pass. But repeated vomiting with nothing staying down can drop you into dehydration faster than it feels like it should, and dehydration is what damages kidneys and lands people on a monitor. If the abortive measures at home are not holding and you cannot drink, that is the signal to go in. There is no prize for suffering through it.

What will the ER do for CHS?

Two things, mostly. First, intravenous (IV) fluids to correct the dehydration, which is the main danger. Second, medications chosen for CHS specifically, because the usual anti-nausea drugs often fail here. Emergency physicians reach for dopamine-blocking agents such as haloperidol or droperidol, and sometimes a benzodiazepine like lorazepam, which have better evidence in CHS than standard antiemetics.

This is the part worth understanding, because it explains why an ER visit for CHS can feel different from what you expected. Ondansetron, the drug most people know as Zofran, is the default for ordinary nausea and it frequently does little in CHS. The emergency medicine literature has landed on the dopamine antagonists, haloperidol and droperidol, as the better-performing options, with benzodiazepines as an adjunct. Tornblom and colleagues note this same pattern: CHS does not respond to the standard antiemetic playbook the way other causes of vomiting do.

Why this matters: If you tell the ER team you use cannabis heavily and that hot showers help, you are handing them the diagnosis. That is not a confession to manage, it is the single most useful piece of information in the room, and it points them straight at the treatments that actually work instead of a round of Zofran that will not.

I am not going to give doses here, and any honest write-up will not. Dosing is the clinician's job at the bedside, adjusted to you. What you should walk in knowing is the shape of the plan: rehydrate, use CHS-appropriate medication, rule out anything that is not CHS, and get you stable enough to keep fluids down on your own.

How do I keep CHS from coming back?

Stop cannabis. That is the prevention, and it is the only prevention that works. Between episodes, olanzapine has some small-series support for reducing recurrence, and it can be discussed with a clinician. But nothing substitutes for cessation, and CHS notably does not respond well to the tricyclic antidepressant prophylaxis used for cyclic vomiting syndrome.

That last point matters if you or a clinician are reaching for the cyclic vomiting syndrome (CVS) playbook, because the two conditions look similar and get confused. CVS often responds to preventive tricyclic antidepressants. CHS does not, in the reports we have. The distinguishing feature, and the therapeutic one, is the cannabis. Remove it and the episodes stop, typically over days to weeks. Keep using and they return no matter what preventive medication gets layered on top.

An honest note on cessation: This is not a lecture and it is not a judgment. Cannabis is legal in much of the country and most people who use it never develop CHS. But if you have it, continued use is the engine of the disease, and the improvement after stopping is usually dramatic enough to be its own evidence. A clinician can help with the how, including support for withdrawal symptoms in the first week or two.

What to do

  1. For the episode right now, use the abortive measures: a hot shower or bath, topical capsaicin cream on the abdomen, rest, and small sips of fluid as you can tolerate them.
  2. Keep drinking whatever you can hold down. Guarding your hydration is the whole point, because dehydration is what actually harms you.
  3. Know the red flags. If you cannot keep fluids down, are urinating little or dark, feel dizzy, faint, or confused, or have chest pain, severe belly pain, or blood in your vomit, go to the ER.
  4. In the ER, expect IV fluids and CHS-appropriate medication such as haloperidol, droperidol, or a benzodiazepine. Tell them you use cannabis and that heat helps, so they skip the treatments that do not work in CHS.
  5. To keep it from coming back, stop cannabis. This is the only cure. Ask a clinician about support, and about olanzapine between episodes if recurrence is a problem.
  6. Do not spend money on supplements, vitamins, or magnesium products sold as CHS treatments. They do not treat or prevent it.

The episode is miserable and the fix is simple to say and hard to do, but it is real: heat and fluids get you through the night, the ER gets you through a bad one, and stopping cannabis gets you out for good.