The only way to fully resolve cannabinoid hyperemesis syndrome (CHS) is to stop using cannabis entirely. Symptoms typically take one to three months of complete abstinence to disappear. But during an active episode, when the nausea and vomiting are severe, several treatments can provide meaningful relief while you work toward that longer-term goal.
What CHS Feels Like and Why It Happens
CHS develops in people who use cannabis heavily, typically four or more times per week for at least a year. It causes waves of intense nausea, repeated vomiting, and abdominal pain centered in the upper stomach area that often radiates outward. These episodes can last 24 to 48 hours at their worst and tend to cycle, meaning you feel fine between flare-ups but then get hit again.
The condition stems from a counterintuitive effect of long-term cannabis use. Cannabis activates certain heat-sensitive receptors in the gut that help regulate digestion. Over time, chronic exposure desensitizes those receptors, disrupting normal stomach motility and triggering vomiting. This is also why hot showers feel like the only thing that helps during an episode. The heat temporarily reactivates those same receptors, briefly restoring normal gut function. That compulsive need for scalding showers is one of the hallmark signs of CHS and often helps distinguish it from other causes of chronic vomiting.
Immediate Relief During an Episode
If you’re in the middle of a CHS flare, the standard anti-nausea medications that work for food poisoning or stomach bugs often fall short. A randomized clinical trial comparing two approaches found that a specific type of antipsychotic medication was significantly more effective than ondansetron (the anti-nausea drug commonly given in emergency rooms). Patients who received the more effective treatment left the ER about 2.5 hours sooner on average (3.1 hours versus 5.6 hours) and were less likely to need additional medications. If you go to the ER for a CHS episode, it’s worth mentioning that you have CHS specifically, since the treatment that works best differs from what’s typically given for general nausea.
Dehydration is the most dangerous part of an active episode. Hours of vomiting can deplete your body’s fluids and electrolytes to the point of kidney damage. In documented cases, patients have shown up with significantly impaired kidney function from fluid loss alone. Intravenous fluids resolve this, but the risk is real if you try to ride out a severe episode at home without being able to keep liquids down.
Capsaicin Cream
One of the more unusual but effective home treatments is over-the-counter capsaicin cream, the same ingredient that makes chili peppers hot. Applied to the upper stomach area three times a day, capsaicin activates those same heat-sensitive receptors that hot showers stimulate, but in a more sustained, targeted way. Case reports describe patients getting dramatic relief, with near-complete symptom resolution within 24 hours. A low concentration (0.075% to 0.1%) is sufficient. The cream will cause a burning sensation on the skin, which fades after repeated use. This won’t cure CHS, but it can make episodes far more manageable.
Why Hot Showers Help but Aren’t a Solution
Nearly everyone with CHS discovers the hot shower trick on their own. Some people spend hours in the shower during flare-ups because it’s the only thing that eases the nausea. The relief is real and grounded in biology: the scalding water fires up the same gut receptors that cannabis has gradually numbed. But the relief only lasts as long as the heat exposure does, and spending hours in hot water carries its own risks, including burns, further dehydration, and dangerously high body temperature. Think of hot showers as a temporary coping tool, not a treatment strategy.
The Only Long-Term Fix: Quitting Cannabis
Complete cessation of all cannabis products is the only treatment that resolves CHS for good. “Complete” means all forms: flower, edibles, concentrates, vape cartridges, and CBD products that contain even trace amounts of THC. Most people see their symptoms fully resolve within one to three months of stopping, though the exact timeline varies.
Reducing your intake without quitting entirely is unlikely to work. The receptor desensitization that causes CHS builds up over months and years of regular use, and cutting back usually isn’t enough to let those receptors recover. Some medications can help manage symptoms during the transition, but their effectiveness drops significantly in people who continue using cannabis even at lower levels.
If you resume cannabis use after recovering, the episodes will almost certainly return. CHS has a very high relapse rate with reintroduction. Many people go through several cycles of quitting, feeling better, trying cannabis again, and ending up back in the ER before they commit to permanent abstinence. The recovery phase resets each time, lasting weeks to months depending on how quickly use is resumed.
Getting Through the Quitting Period
The first few weeks after stopping cannabis can be rough, both because of withdrawal effects like insomnia and anxiety and because CHS symptoms may still be active. During this window, capsaicin cream can help bridge the gap. Staying well-hydrated, eating small bland meals, and avoiding triggers like alcohol or spicy food can reduce the frequency and intensity of nausea episodes as your body recalibrates.
If you’ve been using cannabis daily for years, consider talking to a healthcare provider about support for quitting. Cannabis withdrawal isn’t medically dangerous, but it’s uncomfortable enough that many people relapse before CHS has time to resolve. Having a plan for sleep disruption, appetite changes, and anxiety during those first couple of weeks makes a meaningful difference in sticking with it long enough for the vomiting cycles to stop.
Complications Worth Knowing About
Most CHS episodes, while miserable, resolve without lasting damage. The exceptions involve severe dehydration. Prolonged vomiting can cause acute kidney injury from fluid loss alone, along with dangerous drops in sodium and chloride levels. These complications are treatable with IV fluids, but they can become serious if you’re unable to keep any liquids down for more than several hours. Repeated ER visits for dehydration are common in people with undiagnosed or untreated CHS, sometimes for years before the correct diagnosis is made.
If your vomiting is so severe that you can’t sip water without it coming back up, or if you notice very dark urine, dizziness when standing, or confusion, those are signs that dehydration has progressed to a point where you need medical attention for fluid replacement.