Cannabis is often seen as a relaxing substance used to relieve anxiety, pain, or nausea. However, in some cases, regular cannabis use can have the opposite effect and cause severe vomiting. This is known as Cannabinoid Hyperemesis Syndrome (CHS).

What is CHS?

Cannabinoid Hyperemesis Syndrome is a rare but real condition. It mostly affects people who use cannabis regularly and over a long period (several times a week, sometimes for years). CHS involves repeated episodes of:

• Intense nausea
• Uncontrollable, frequent vomiting (sometimes several times per hour)
• Abdominal pain
• Loss of appetite
• Weight loss and dehydration

A particular sign of CHS is temporary relief from symptoms by taking very hot showers or baths. Many people with CHS report spending hours under hot water to ease their discomfort.

Why does it happen?

Researchers don’t fully understand the mechanism behind CHS. What we do know is that cannabis affects the endocannabinoid system, a network of receptors in the body that plays a role in functions like digestion. In some people, chronic cannabis use may disrupt this system and cause the opposite of the intended effect: instead of relieving nausea, cannabis triggers it.

How is CHS treated?

There is no specific medication to cure CHS. During an episode, individuals often need to go to the hospital to receive IV fluids and anti-nausea treatment. However, the only effective long-term treatment is to completely stop using cannabis.

In most cases, symptoms go away entirely within a few days or weeks after stopping cannabis.

If you’re looking for help to reduce or stop your cannabis use, contact us anytime at 1-800-265-2626 or use the chat at the bottom right of your screen. It’s free, confidential, and available 24/7.