Medical professionals are raising urgent concerns about cannabis hyperemesis syndrome, a condition now increasingly recognised as cannabis use rises across the United States and worldwide. The syndrome, commonly referred to as the CHS condition, was only formally identified in 2004 but is now being diagnosed more frequently in emergency rooms.

Though relatively rare -affecting about 3% of chronic users, the illness can cause devastating health effects. Patients experience unrelenting nausea, severe abdominal pain, and persistent vomiting that can lead to dangerous complications such as kidney failure and dehydration.

Doctors stress that awareness of cannabis hyperemesis syndrome remains low despite its seriousness, and they warn that more cases are likely as cannabis products grow stronger and consumption becomes more widespread.

Early Signs and Difficult Diagnoses

Before the CHS condition was recognised in the medical literature, emergency physicians often found themselves baffled. Patients would arrive at hospitals suffering violent retching episodes, sometimes enhanced by behaviours such as inducing vomiting. In one memorable case in New Jersey, a young man repeatedly came to the emergency department displaying these unusual symptoms.

At the time, cannabis was still widely seen as a treatment for nausea rather than a cause of it, and few doctors made the connection. It was only years later that many clinicians realised these were classic signs of cannabis hyperemesis syndrome.

Real-Life Consequences of the CHS Condition

Doctors who have practised in the field for decades describe the tragic effects. One elderly woman, who had successfully used medical cannabis to ease arthritis and gastrointestinal pain, ended up in intensive care with kidney failure. She had to stop using cannabis entirely despite its earlier benefits, returning to prescription drugs she had once hoped to avoid.

Another patient suffering from chronic musculoskeletal pain reported that he continued using cannabis despite repeated episodes of vomiting. For him, the relief from pain outweighed the distress caused by the CHS condition.

Medical experts caution that while some patients attempt to manage their symptoms with hot showers—a temporary relief linked to the way THC affects body temperature—true recovery only comes when cannabis use stops completely.

Why Cannabis Hyperemesis Syndrome Occurs

Researchers are still studying why cannabis hyperemesis syndrome affects only some users. Evidence shows that cannabis has a biphasic effect: small doses can reduce nausea, but high doses may trigger it.

Theories suggest that overstimulation of receptors in the gut slows digestion, disrupts the lower oesophageal sphincter, and causes gastric distress. Another possibility is that cannabis receptors in blood vessels become engorged, leading to abdominal pain and vomiting.

Genetic factors may also play a role. Some patients with the CHS condition carry markers that make them more susceptible. However, research shows that even people without genetic predisposition can develop the syndrome when consuming large amounts of THC-heavy cannabis daily.

Limited Treatment Options

Treatment for cannabis hyperemesis syndrome remains challenging. In hospitals, doctors may use intravenous fluids, anti-psychotic medications such as haloperidol or olanzapine, benzodiazepines, or capsaicin cream applied to the skin. These measures provide only temporary relief.

Ultimately, complete cessation of cannabis use is the only effective long-term solution. Studies show that around 90% of patients improve once they stop using cannabis, although relapse often occurs quickly if they resume consumption.

Rising Prevalence and Calls for Awareness

As legalisation spreads and cannabis potency rises, doctors expect the CHS condition to become more prevalent. They caution that public awareness has not kept pace with the growth of the cannabis industry. Many users remain unaware that a substance they believe to be harmless or even beneficial can, in some cases, cause serious harm.

Physicians now advise both the public and their colleagues to remain alert for the signs of cannabis hyperemesis syndrome. A patient presenting with severe vomiting, abdominal pain, and relief from hot showers should prompt immediate consideration of the condition.

Source: Psychology Today