WHY IT MATTERS: If you use cannabis daily and experience recurring vomiting that improves with hot showers, you may have cannabis hyperemesis syndrome, and stopping cannabis use is currently the only reliable cure. CLINICAL OVERVIEW: Cannabis hyperemesis syndrome (CHS) is a paradoxical condition in which chronic, heavy cannabis users develop cyclic episodes of severe nausea, vomiting, and abdominal pain, often relieved temporarily by hot showers or baths. The syndrome is frequently misdiagnosed for months or years because patients and clinicians alike associate cannabis with antiemetic properties, creating a counterintuitive diagnostic barrier.