‘It’s honestly hell.’ Hospitals see rare vomiting syndrome in heavy marijuana consumers.

Dr. Jay Fong, a pediatric gastroenterologist at UMass Memorial Children's Medical Center, says he and his team see many cases of cannabinoid hyperemesis syndrome. Pat Greenhouse/Globe Staff

Since recreational marijuana became legal in Massachusetts three years ago, hospitals have noticed more cases of a rare illness afflicting a small portion of heavy cannabis consumers.

The condition, called cannabinoid hyperemesis syndrome, can be horrific for patients, causing intense abdominal pain, nausea, and days-long vomiting episodes that are strangely relieved by hot showers or baths. The illness can be cured by quitting pot.

“It’s honestly hell,’’ said Alice Moon, 30, a marijuana industry public relations professional in Los Angeles who stopped consuming cannabis in January after vomiting for 16 days straight. “I looked like a skeleton.’’

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