Cannabis Hyperemesis Syndrome: What It Is, Who Gets It, and How to Find Relief

Slug: blog/cannabis-hyperemesis-syndrome Adult sitting beside a running shower with a glass of water during a difficult health episode Cannabis hyperemesis syndrome (CHS) is a medical condition linked to long-term, frequent cannabis use. It causes repeated cycles of intense nausea, vomiting, and abdominal pain. One of its most recognizable features is the urge to take very hot showers or baths because heat may provide temporary relief. CHS can be confusing and distressing. Some people use cannabis because they believe it helps nausea, pain, stress, or appetite: then find themselves caught in a cycle where continued use may worsen their symptoms. There is no stigma in seeking help. Understanding cannabis hyperemesis syndrome can help you recognize warning signs, make informed decisions, and get appropriate medical care. Important: Severe or repeated vomiting can cause dehydration, kidney injury, electrolyte problems, and other complications. If you cannot keep fluids down, are barely urinating, feel faint or confused, have a racing heartbeat, vomit blood, or develop severe abdominal pain, seek urgent medical care.

What is cannabis hyperemesis syndrome?

CHS is often described as a gut-brain axis disorder. The gut-brain axis is the two-way communication network linking the digestive system, nervous system, immune system, and hormonal pathways. Cannabis compounds interact with this network through the body’s endocannabinoid system, including cannabinoid receptors known as CB1 receptors. In the short term, cannabis may affect nausea, appetite, pain, and digestion in ways that feel helpful. With chronic, high-dose exposure, however, the system may become dysregulated in some people. Researchers believe prolonged stimulation of CB1 receptors may interfere with normal gastrointestinal function, nausea signaling, and thermoregulation: the body’s process for maintaining temperature. The exact cause is not fully established, and not everyone who uses cannabis develops CHS. Still, the recurring pattern is well recognized: frequent long-term use, episodes of severe vomiting, temporary relief from hot bathing, and improvement after stopping cannabis. Approachable visual representation of the gut-brain connection with water and a green plant in the background

Who gets CHS?

Cannabis hyperemesis syndrome most often appears in people who use cannabis frequently over an extended period. Many reported cases involve daily or near-daily use, although weekly use has also been described. Symptoms may begin after several years, but the timeline varies widely. Factors commonly seen in people diagnosed with CHS include:

Long-term cannabis use: Symptoms may develop after years of use, sometimes following a long period without problems.
Frequent or high-dose use: Daily use, concentrated products, and repeated dosing may increase cannabinoid exposure.
A history beginning in adolescence: Some clinical descriptions note a higher frequency among adults who began using cannabis during their teenage years.
Repeated unexplained vomiting: People may visit urgent care or the emergency department several times before CHS is considered.
Compulsive hot bathing: Repeatedly seeking hot showers or baths for nausea relief is an important clinical clue. These factors do not prove that someone has CHS. A healthcare professional must evaluate the full picture and rule out other causes, including infection, pregnancy, medication effects, gastrointestinal obstruction, pancreatitis, cyclic vomiting syndrome, and neurological or metabolic conditions.

The three phases of cannabis hyperemesis syndrome

CHS is generally described in three phases. Not everyone experiences them in exactly the same way, and symptoms can overlap.

1. Prodromal phase

The prodromal phase may last weeks, months, or even years. Common signs include early-morning nausea, vague abdominal discomfort, anxiety about vomiting, and reduced appetite. Some people do not vomit during this stage. A particularly confusing pattern can occur: a person may use more cannabis because they believe it will settle their stomach. If CHS is developing, that response may intensify the underlying cycle.

2. Hyperemetic phase

The hyperemetic phase is the acute stage. It can involve:

Repeated, forceful vomiting or retching
Severe nausea that may not respond well to standard anti-nausea medicine
Abdominal pain or cramping
Sweating, flushing, weakness, and loss of appetite
Inability to eat or drink normally
Compulsive hot showers or baths Episodes may last about 24 to 48 hours, although the overall illness and need for medical monitoring can last longer. This is the phase most likely to require emergency care. Repeated vomiting can lead to dehydration, kidney injury, electrolyte imbalance, esophageal irritation, and unintended weight loss.

3. Recovery phase

The recovery phase begins when symptoms settle, especially after cannabis use stops. Appetite and hydration gradually return, and the urge to take hot showers usually fades. Some people feel substantially better within days, while full recovery may take weeks or longer. Returning to cannabis can trigger another episode, sometimes after a period of feeling completely well. For people with CHS, complete cessation is the only consistently reported long-term resolution.

Why do hot showers seem to help?

Compulsive hot bathing is one of the hallmark signs of CHS. Many people discover accidentally that hot water temporarily calms their nausea or abdominal pain, then begin showering repeatedly or staying in the bath for long periods. The leading explanation involves the TRPV1 receptor, a heat- and capsaicin-sensitive receptor found on sensory nerves in the skin and digestive system. Hot water and topical capsaicin may activate TRPV1 pathways, which could dampen pain and nausea signaling. Heat may also influence the hypothalamus, a brain region involved in vomiting and temperature regulation. Another proposed explanation is “cutaneous steal,” in which heat redirects blood flow toward the skin and away from the digestive tract. These theories are scientifically plausible but not proven as the single cause of CHS. The important practical point is that hot water may mask symptoms without treating the underlying condition. Use caution. Very hot water can cause burns, dizziness, fainting, and additional fluid loss through sweating. Never use scalding water as a home treatment, and do not delay medical care because a shower provides temporary relief.

What does the science say causes CHS?

Researchers do not yet have a complete explanation for why some frequent cannabis users develop CHS while others do not. The leading model is that chronic, high-dose exposure: particularly to THC: may disrupt CB1 receptor signaling over time. That disruption may affect:

Movement of food through the gastrointestinal tract
The body’s normal nausea and vomiting pathways
Stress and hormonal signaling
Blood flow in the digestive system
Hypothalamic thermoregulation THC is also fat-soluble and can remain in the body for an extended period. Researchers have proposed that long-term accumulation may contribute to toxicity or altered signaling in the brain and gastrointestinal tract. Genetics, product potency, dose, frequency, individual physiology, and coexisting health conditions may also play a role. CHS remains a diagnosis based on clinical history and exclusion of other conditions. A test that independently confirms CHS is not currently available.

Treatment realities: what can and cannot help

During an acute episode, treatment focuses on safety, hydration, and symptom control. In an emergency department, clinicians may provide:

IV fluids and electrolytes to address dehydration and abnormal blood chemistry
Antiemetics such as ondansetron, although these may provide incomplete relief in CHS
Topical capsaicin cream, often applied under clinical guidance, because it may engage TRPV1 pathways in a way similar to heat
Haloperidol or another dopamine-blocking medicine in selected cases
Benzodiazepines in selected cases for severe distress, nausea, or agitation
Monitoring for kidney injury, electrolyte abnormalities, and complications from vomiting These medicines require professional evaluation. Do not use haloperidol, benzodiazepines, or someone else’s prescription at home. Capsaicin can irritate or burn skin and should be used only as directed by a clinician or pharmacist. Hot showers may offer short-term comfort, but they are not a cure. The only known long-term resolution is complete cessation of cannabis, including THC- and CBD-containing products. If stopping feels difficult, that is a reason to seek support: not a reason for shame. A primary care clinician, mental health professional, or substance-use counselor can help create a practical plan. Withdrawal symptoms such as irritability, sleep changes, reduced appetite, anxiety, or cravings may occur and deserve compassionate care.

A new diagnostic code took effect in October 2025

Starting October 1, 2025, the United States ICD-10-CM code set added R11.16: Cannabis hyperemesis syndrome. This gives clinicians and medical coders a specific code for CHS rather than relying only on general vomiting codes and cannabis-related codes. A useful clarification: ICD-10-CM is the U.S. clinical modification of ICD-10. It is often described casually as an “ICD-10 code,” but R11.16 is not a new code in the original WHO base ICD-10 classification. Additional codes may be used for cannabis-related disorders, dehydration, electrolyte abnormalities, or other complications, depending on the clinical documentation and local coding rules.

How to talk to a doctor without stigma

Honest information helps clinicians distinguish CHS from other serious conditions. You can begin with a direct statement such as “I use cannabis regularly, and I’ve had repeated episodes of nausea and vomiting. Hot showers seem to help. Could cannabis hyperemesis syndrome be part of what’s happening?” Before your appointment, consider noting:

How often you use cannabis and which product types you use
The approximate THC potency, if known
When nausea and vomiting began
Whether symptoms are worse in the morning
How often you shower or bathe for relief
Previous emergency visits, tests, or diagnoses
Any medications, supplements, alcohol, or other substances A supportive clinician should listen without judgment, assess for dehydration and other causes, and explain treatment options clearly. If you feel dismissed, you can ask for the reasoning behind the diagnosis or seek a second opinion.

The bottom line

Cannabis hyperemesis syndrome is a serious but often overlooked condition associated with long-term, frequent cannabis use. The classic pattern includes prodromal nausea, a hyperemetic phase with repeated vomiting, and recovery after cannabis cessation. Compulsive hot showers are a valuable clue, but temporary relief does not mean the underlying problem is resolved. Our goal at Green Grove Bud is to foster a stigma-free space where accurate information supports thoughtful, responsible choices. If CHS sounds familiar, connect with a healthcare professional promptly. With honest communication, appropriate acute care, and support for stopping cannabis, many people can move toward lasting recovery.